BJD Glossary: Essential Ball-Jointed Doll Terms Explained
Understanding BJD Terminology: A Practical Buying Reference
If you are new to the ball-jointed doll hobby, this BJD glossary helps you understand the terms you will see in listings, size guides, and product options before you order. This glossary covers the terms you will encounter when reading listings, comparing sizes, and making purchasing decisions.
Important foundation: Ball-jointed dolls (BJDs) are poseable, customizable dolls with articulated joints, typically held together by internal elastic stringing and designed for disassembly, styling, and long-term collecting. They differ from vinyl fashion dolls, static figures, and mass-market toys in their construction, materials, and customization potential.
Core principle: Terminology provides useful context, but brand-specific definitions, actual centimeter measurements, and the product page’s inclusion list always take priority. A size label helps you search and compare. The detailed specifications tell you what fits, what ships, and what you still need to purchase separately.
This glossary is organized by how terms affect real buying decisions: configurations, scale, customization, accessories, care, ordering logistics, and authenticity. For broader beginner guidance, see the BJD Library. For measurement-focused size references, see the BJD Size Chart.
Quick-Start Guide: How to Read a BJD Product Listing
Before you click buy, verify these details in order:
- Identify the base item. Is this a complete doll, a head only, a body only, or a configurable product with selectable options?
- Check what is included by default. Separate what ships automatically from what is optional, sold separately, or shown only for styling reference.
- Confirm measurements. Record height, head circumference, chest, waist, hips, arm length, inseam, and foot length if they matter for accessories or display.
- Verify the timeline. Determine whether the item is in stock, part of a preorder window, or made to order. Production time and shipping time are separate.
- Review photos critically. Styled images often show wigs, eyes, clothing, props, or body blushing that may not be included in the base purchase.
Treat product photos as styling inspiration, not package inventories.
Four-label listing check: When reading a BJD product page, mentally label each visible item as included by default, optional add-on, sold separately, or reference only. This habit prevents many beginner ordering mistakes.
Always cross-check with the written inclusion list.
Category Summary at a Glance
| Terminology Category | Key Terms Covered | Why This Category Matters |
|---|---|---|
| Configurations | BJD, Resin BJD, Blank Doll, Fullset, Basic Doll, Head Only, Body Only | Clarifies what the seller is offering and what you need to complete the doll. |
| Scale & Anatomy | 1/6, 1/4, 1/3, YoSD, MSD, SD, 70cm+, Body Proportions | Provides size context but must be verified with actual measurements for fit. |
| Aesthetics & Modding | Face-Up, Body Blushing, Seam Sanding, Sueding, KIPS | Explains what is factory-finished, what is custom, and what can be modified. |
| Styling & Fit | Wig Circumference, Eye Diameter, Iris Ratio, Eye Putty | Ensures accessories match the head and body measurements, not just scale labels. |
| Care & Materials | Polyurethane Resin, UV Yellowing, MSC, Elastic Tension, Restringing | Guides safe handling, maintenance, and realistic expectations for material aging. |
| Logistics & Orders | Preorder, Made to Order, In Stock, Lead Time, Layaway | Prevents timeline confusion and payment surprises. |
| Authenticity & Market | COA, Recast, Authorized Dealer, Provenance | Helps identify legitimate products and evaluate secondhand purchases. |
Core Doll Configurations & Offerings
BJD (Ball-Jointed Doll)
Meaning: A poseable doll with articulated ball-and-socket joints, typically held together by internal elastic stringing and designed for customization, disassembly, and pose adjustment. Most BJDs use this construction, though some may incorporate alternative joint systems, magnetic components, or hybrid structures.
Resin BJD
Meaning: A BJD cast from polyurethane resin, a hard casting material valued for its ability to capture fine sculpt detail. Resin dolls require careful handling as they can chip, crack, or break from impact.
Sculpt
Meaning: The underlying face or body design before styling elements like wigs, eyes, and face-up are applied. The same sculpt can appear dramatically different depending on customization choices.
Blank Doll (Nude / Basic Doll)
Meaning: A doll sold without face-up and typically without wig, eyes, or clothing, though specific inclusions vary by brand. Some brands use “basic” to denote a version with minimal default accessories; always verify the configuration on the product page.
Fullset
Meaning: A more complete doll package that may include the doll body, face-up, eyes, wig, outfit, shoes, and accessories. The exact contents vary significantly by brand and listing. Fullset does not guarantee that every item visible in styled photos is included—props, alternate outfits, and decorative elements shown for presentation may be sold separately or not included at all.
Head Only / Body Only
Meaning: A listing offering only the head sculpt or only the body. Useful for customizers and hybrid builds, but requires attention to neck joint compatibility, resin color matching, and proportional fit between parts from different makers.
Scale, Sizing & Anatomical Terminology
Important context: Scale ratios (1/6, 1/4, 1/3) and community size names (YoSD, MSD, SD) originated from specific brand product lines and have been adopted broadly within the community. They are not standardized global sizing systems. Two dolls labeled “MSD” or “1/4” from different makers may have different heights, body proportions, and accessory compatibility. Always use actual centimeter measurements, head circumference, and body dimensions when selecting clothing, wigs, shoes, and eyes.
1/6 Scale & YoSD (Yo-Size Dollfie / Tiny)
Meaning: 1/6 refers to a proportional scale ratio. YoSD (originally from Volks) and “Tiny” are community terms for small BJDs, typically with child-like proportions and heights around 26 cm to 30 cm. These terms are often used interchangeably in community contexts but do not guarantee identical fit across brands.
1/4 Scale & MSD (Mini Super Dollfie)
Meaning: 1/4 refers to a proportional scale ratio. MSD is a size category commonly used for dolls around 40 cm to 45 cm, though exact heights and body types vary. Some MSD dolls have child proportions, others have slim or mature builds. Clothing fit depends on chest, waist, shoulder width, and body shape, not just the MSD label.
1/3 Scale & SD (Super Dollfie)
Meaning: 1/3 refers to a proportional scale ratio. SD is a size category typically associated with dolls around 55 cm to 65 cm. Body proportions, gender presentation, and build style vary widely within this category. Verify shoulder width, chest, waist, hip, and foot measurements before purchasing clothing or shoes.
70cm+ / Senior Scale / Large Dolls
Meaning: A general market and community term for very large BJDs, often around 70 cm and taller, though some dolls in this range may start closer to 65 cm or exceed 75 cm. Terms like “Senior,” “Super Senior,” or “Uncle” are maker-specific and not universal standards. These dolls require more storage space, stronger stands, and careful handling due to their weight.
Body Proportions & Fit Terms
Meaning: Terms like child body, mature body, slim body, muscular body, bust, waist, hips, inseam, arm length, foot length, and foot width describe body shape and measurements. Two dolls of the same height can have completely different clothing and shoe requirements depending on these details.
Face-Up, Blushing & Customization Terms
Face-Up
Meaning: The painted facial details applied to a BJD, typically including eyebrows, eyeliner, eyelashes, eye shading, lip color, and subtle facial contouring. Face-up significantly impacts the doll’s character and expression.
Body Blushing
Meaning: Airbrushed or hand-painted shading applied to the body, commonly on hands, feet, joints, chest, or other areas to add depth and visual finish. Body blushing is often optional and may not be included in base pricing.
Seam Sanding (Seam Line Removal)
Meaning: The process of smoothing visible mold lines left where casting parts meet. Some makers include this as standard; others offer it as an add-on service.
Sueding & KIPS
Meaning: Techniques used to improve joint friction and posing stability. Sueding typically involves adding textured fabric or material inside joints. KIPS generally refers to small support pieces, often silicone, placed in joints. Application methods and materials vary by maker and customizer.
Eyes, Wigs & Accessory Fit
Wig Size (Head Circumference)
Meaning: Wig fit is determined by measuring the circumference of the doll’s head, typically around the widest part above the eyebrows and ears. Wig sizes are usually listed in inches or centimeters. Doll height and scale labels do not reliably predict wig size—always measure the head or consult the maker’s specifications.
Eye Size (Diameter in mm) & Iris Ratio
Meaning: Eye diameter is the total size of the eye hemisphere or acrylic piece, measured in millimeters. Iris ratio refers to how much of the visible eye surface is occupied by the colored iris versus the white sclera. Larger iris ratios create a more stylized or anime-inspired look; smaller ratios appear more realistic. Both diameter and iris ratio affect expression and character.
Eye Putty
Meaning: A reusable adhesive material used to position and secure eyes inside the head cavity. Use only doll-safe, non-staining putty designed for resin or the specific material of your doll.
Outfit, Shoes, Props, and Stands
Meaning: Clothing, footwear, decorative items, and display stands used with the doll. Fit depends on actual body measurements and shoe sole length, not just scale or size category labels. Verify dimensions before purchasing.
Materials, Maintenance & Care Terms
Resin (Polyurethane Resin)
Meaning: In the BJD context, “resin” typically refers to polyurethane resin, a hard casting material used for its durability and ability to capture fine sculpting detail. It requires careful handling to avoid chips, cracks, and breaks.
UV Yellowing (Resin Aging)
Meaning: A gradual color shift in resin caused by ultraviolet light exposure, environmental factors, and material aging over time. UV exposure is a major factor, while heat and storage conditions may also contribute to material aging over time. UV yellowing is a material characteristic, not surface dirt, and cannot be fully prevented. Store dolls away from direct sunlight and strong UV sources to slow the process.
MSC (Mr. Super Clear)
Meaning: A brand of matte aerosol sealant commonly used in face-up work to set and protect painted details. MSC should be used in well-ventilated areas that meet the product’s safety requirements, away from open flames or heat sources. Wear appropriate respiratory protection and follow all safety data sheet instructions. If you are unfamiliar with spray sealant application, consider working with an experienced face-up artist.
Restringing & Elastic Tension
Meaning: Restringing is the process of replacing or adjusting the internal elastic cord that holds the doll’s parts together. Over time, elastic can stretch or lose tension, resulting in looser joints and reduced posing stability. Restringing is a normal part of BJD maintenance.
Preorders, Production & Ordering Logistics
Preorder, Made to Order, and In-Stock
Meaning: These terms describe order fulfillment methods. Preorder typically means the seller opens a limited order window and arranges production or allocation afterward; the doll may be made to order, produced in a batch, or allocated from planned inventory. Made to order means production begins after your individual order is placed. In stock means the item is finished and available to ship immediately. Specific definitions, production timelines, and shipping schedules vary by studio—always refer to the seller’s order page for exact terms.
Production Lead Time vs. Transit Time
Meaning: Production lead time is the period required for the studio to manufacture and prepare the doll after the order is confirmed. Transit time is the duration the package spends in shipping after it leaves the studio. Faster shipping does not reduce production time. Total delivery time is the sum of both periods.
Layaway / Installment Plan
Meaning: A payment structure allowing buyers to pay in installments over time. Terms, deposit requirements, payment schedules, and cancellation policies vary widely by seller. Review all terms before committing.
Deposit, Balance Payment, Cancellation, and Refund Policies
Meaning: Financial and timeline terms that define when payments are due, what happens if plans change, and whether deposits are refundable. Policies differ significantly across studios and dealers. Read all terms carefully before placing an order.
Authenticity, Dealers & Provenance
Certificate of Authenticity (COA)
Meaning: A document or card provided by some makers to help identify the doll’s origin and model. Not all brands issue COAs. A COA is a useful supporting document but does not serve as sole proof of authenticity. It can be lost, transferred, or separated from the doll. When buying secondhand, request the COA alongside photos of the doll, packaging, and any maker marks, and verify that details match.
Recast (Unauthorized Reproduction)
Meaning: An unauthorized copy of an original BJD sculpt, typically created by casting a mold from an existing doll without the sculptor’s or brand’s permission. The terms “counterfeit” and “bootleg” are sometimes used in community or legal contexts with slightly different implications depending on trademark, copyright, and jurisdiction. Avoid unverified sellers and sources with suspiciously low prices or vague product descriptions.
Authorized Dealer
Meaning: A retailer officially recognized by the brand or studio to sell their products. Authorized dealer status can change, so verify current authorization through the maker’s official website or contact them directly when possible. Authorized dealers generally provide clearer paths to customer support and legitimate provenance.
Provenance
Meaning: The documented history of a doll’s ownership and origin. Strong provenance includes original purchase receipts, COA, dated photos, seller history, and packaging. Good provenance makes secondhand purchases easier to verify but should be evaluated alongside other authenticity indicators.
Blank, Fullset, and Package Configuration Reference
This table translates common listing terms into verification checkpoints.
| Listing Term | What It Usually Means | What May Be Included | What the Buyer Must Verify |
|---|---|---|---|
| Blank Doll | Unstyled doll without face-up | Doll body and head; accessories vary by brand | Whether face-up, wig, eyes, outfit, shoes, or other accessories are included or optional |
| Head Only | Head sculpt sold separately | Head only, sometimes with optional face-up | Neck joint type, body compatibility, and resin color match |
| Body Only | Body sold separately | Body and internal stringing | Head compatibility, neck joint, resin color, and whether assembly is required |
| Assembled Doll | Doll arrives strung and assembled | Body and head pre-assembled | Whether the doll is blank or styled; what accessories are included |
| Fullset | More complete package with styling and accessories | Varies widely; may include face-up, wig, eyes, outfit, shoes, and accessories | Exact inclusion list; which items in photos are included versus reference-only |
| Default Version | Standard configuration offered by the maker | Base doll; styling and accessories depend on maker | Whether default includes face-up or styling, or only the blank doll |
| Optional Add-On | Extra item or service selected separately | Face-up, body blushing, outfit, wig, eyes, extra hands, or other upgrades | Whether add-ons are selected in cart and correctly priced |
| Outfit Set | Clothing package, may or may not include doll | Clothing items, possibly shoes or accessories | Whether the doll itself is included or sold separately |
| Limited Version / Limited Edition | Special release with restricted availability | Often includes exclusive styling, accessories, or packaging | Order window, production quantity, and what makes the version “limited” |
For detailed guidance on choosing between configurations, see the Blank vs Fullset BJD guide.
Common BJD Term Confusions & Clarifications
- BJD vs. Dollfie
- BJD is the broad category term for ball-jointed dolls. “Dollfie” is associated with specific Volks product lines but is also used informally in some community contexts. Treat brand-specific terms carefully and refer to the maker’s own terminology.
- 1/4, 1/3, 1/6 vs. MSD, SD, YoSD
- Scale ratios (1/4, 1/3, 1/6) describe proportional relationships. Size category names (MSD, SD, YoSD) originated from specific brands and are now used broadly in the community. Neither system guarantees identical clothing fit, head circumference, or accessory compatibility across brands. Always use actual body measurements.
- Fullset vs. Everything in the Photo
- Fullset means a more complete package, but it does not automatically include every item visible in styled photos. Props, alternate outfits, backgrounds, and decorative elements may be shown for presentation and not included in the purchase. Example: A fullset photo showing the doll with a teacup, book, and chair may only include the doll, face-up, wig, eyes, and outfit—the props may be sold separately or unavailable.
- Blank vs. Unfinished or Defective
- Blank refers to an unstyled doll without face-up, not a defective or incomplete product. Blank dolls are intentional configurations for buyers who prefer to customize independently.
- Wig Size vs. Doll Height
- Wig fit is determined by head circumference, not doll height or scale label. Measure the head around its widest point and compare to the wig size chart. Example: Two MSD dolls may require different wig sizes if one has a 7-8 inch head and the other has an 8-9 inch head.
- Preorder vs. Ready-to-Ship
- Preorder means the item will be produced or allocated after the order window closes; shipping occurs only after production is complete. In-stock or ready-to-ship items can be dispatched immediately. Preorders may require weeks or months of waiting beyond transit time.
- Production Time vs. Shipping Time
- Production time is how long the studio takes to make the doll. Shipping time is how long the carrier takes to deliver after the package leaves the studio. Expedited shipping only shortens transit time—it does not reduce production time.
- COA vs. Complete Proof of Authenticity
- A COA is a helpful supporting document but not sufficient proof on its own. Secondhand verification should include the COA, photos matching the doll to the certificate, original packaging or receipts if available, and seller history. Example: A COA for a normal skin doll paired with a white skin body is a red flag and requires further investigation.
- MSD Clothing Fit Across Brands
- Two dolls both labeled MSD may have significantly different chest, waist, shoulder, and hip measurements depending on whether they have child, slim, or mature body types. Always compare detailed body measurements, not just the MSD label, before purchasing clothing.
Term-to-Decision Action Matrix
| If You See This Term | It May Affect | Check This Before Ordering |
|---|---|---|
| Blank | Amount of styling work and additional purchases required | Face-up availability, wig, eyes, outfit, and shoes |
| Fullset | Total cost and what is included out of the box | Exact inclusion list; compare photos to written description |
| MSD / SD / YoSD | General size range but not guaranteed fit | Actual height, chest, waist, hip, shoulder, head circumference, and foot measurements |
| Preorder | Total wait time before receiving the doll | Order window close date, estimated production time, and shipping timeline |
| Made to Order | Whether the doll is in existing inventory | Production lead time and payment schedule |
| Body Choice | Pose style, aesthetic, and clothing fit | Detailed body measurements and proportion type |
| Skin Tone / Resin Color | Visual appearance and hybrid part matching | Brand’s color name, batch consistency notes, and comparison photos if building hybrids |
| Wig Size | Whether the wig will fit securely | Head circumference in inches or centimeters |
| Eye Size | Physical fit and visual expression | Recommended diameter, iris ratio, and socket depth |
| Recast | Authenticity, resale value, and ethical considerations | Seller reputation, price reasonability, and provenance documentation |
| Limited Edition | Future availability and order urgency | Order period end date, production quantity, and what makes it limited |
| Default Version | What you receive if no customization is selected | Whether default includes face-up, wig, or eyes, or only the blank doll |
Pre-Purchase Listing Verification Checklist
Before completing checkout, confirm these details:
- What exactly am I buying? (Head, body, complete doll, blank, or fullset?)
- What is included by default in the base price?
- What is optional or sold separately?
- Is face-up included, optional, or not offered?
- Are wig, eyes, outfit, and shoes included?
- What are the doll’s actual measurements? (Height, head circumference, chest, waist, hips, foot length)
- What eye diameter and wig size are recommended?
- What is the resin color or skin tone option?
- Is this item in stock, preorder, or made to order?
- What is the production lead time?
- What is the estimated shipping or transit time?
- What are the deposit, payment schedule, cancellation, and refund terms?
- Who is the seller or studio, and are they an authorized dealer?
- If buying secondhand: What is the provenance? (Receipt, COA, photos, seller history)
For a broader beginner buying framework, see the First BJD Buying Checklist.
Frequently Asked Questions
- What does BJD stand for?
- BJD stands for ball-jointed doll, a poseable doll with articulated joints, typically assembled with internal elastic stringing and designed for customization.
- What is a blank BJD?
- A blank BJD is an unstyled doll sold without face-up and typically without wig, eyes, or clothing, though exact inclusions depend on the brand’s definition of “blank.”
- What does fullset mean in BJD?
- Fullset refers to a more complete doll package that may include face-up, wig, eyes, outfit, shoes, and accessories, but exact contents vary by maker. Always check the written inclusion list rather than relying on photos alone.
- What is a face-up on a BJD?
- A face-up is the painted styling applied to the doll’s face, including eyebrows, eyeliner, eyelashes, eye shading, lip color, and facial contouring.
- What does MSD mean?
- MSD (Mini Super Dollfie) is a size category commonly used for BJDs around 40 cm to 45 cm. It is not a universal fit standard—body proportions and measurements vary across brands.
- What does SD mean?
- SD (Super Dollfie) is a size category typically used for larger BJDs around 55 cm to 65 cm. Like MSD, it is a general reference, not a guarantee of identical proportions or accessory fit across makers.
- Are BJD sizes universal across brands?
- No. Size labels like YoSD, MSD, SD, 1/6, 1/4, and 1/3 are useful for general comparison but do not guarantee consistent measurements, proportions, or accessory compatibility. Always use centimeter measurements and body dimensions for fit decisions.
- How do I choose a BJD wig size?
- Measure the doll’s head circumference (typically around the widest part above the eyebrows and ears) and compare it to the wig size chart. Do not rely on doll height or scale label alone.
- How do I choose BJD eye size?
- Check the maker’s recommended eye diameter in millimeters. Consider iris ratio (the proportion of colored iris to white sclera) to achieve your desired expression style.
- What does preorder mean for a BJD?
- Preorder typically means the seller opens an order window and production or allocation occurs afterward. The doll may be made to order, produced in a scheduled batch, or drawn from planned inventory. Specific timelines and processes vary by studio—always check the order page for details.
- What is a recast BJD?
- A recast is an unauthorized reproduction of an original BJD sculpt, created without the sculptor’s or brand’s permission. Avoid unverified sellers and listings with suspiciously low prices.
- Does a fullset include everything shown in the photos?
- Not necessarily. Styled photos may include props, backgrounds, alternate outfits, or decorative items that are not part of the package. Always verify the written inclusion list.
- What is the difference between production time and shipping time?
- Production time is the period the studio needs to manufacture the doll. Shipping time is how long the package takes to travel after it is dispatched. Total delivery time is the sum of both.
- What should I check before buying a BJD?
- Verify the exact item being sold, what is included by default, actual measurements, timeline (in stock, preorder, or made to order), seller or studio identity, and all payment and cancellation terms.
Conclusion: Use Terminology as Context, Verify with Details
BJD terminology provides helpful context for navigating listings and understanding product types, but it should never replace verification of exact measurements, included items, production timelines, and brand-specific definitions. Terms like MSD, SD, blank, fullset, preorder, and recast guide your search and help you ask the right questions—but the final purchasing decision must be based on the product page’s specifications, the maker’s official information, and the seller’s stated policies.
This glossary is designed to help you interpret listings accurately and avoid common misunderstandings. As you gain experience, you will develop a stronger sense of which terms require the most careful verification and which makers use terminology consistently.
For additional resources, return to the BJD Size Chart for measurement-focused size references, or visit the BJD Library for broader beginner guidance.
