YMDK's blank customization keycaps combine a DSA profile, 1.4mm ABS walls, and an MX cross stem, sold one piece at a time in sizes from 1.25u up to 7u.
This article covers what they actually fit, how the smoked-clear finish behaves in practice, and who should skip them entirely.
Overview
This is a single-piece replacement keycap with no printed legends. It is aimed at pinpoint jobs rather than full rebuilds: a cracked spacebar, a Shift that does not match your layout, or one key you want to blank out as a tactile marker.
The material is ABS, wall thickness is roughly 1.4mm, the profile is DSA, and the color is black-clear (a smoked, semi-transparent black).
As of the Amazon.co.jp listing data captured on 14 May 2026, the product shows 90 reviews at 5.0 out of 5 stars — a 100% positive rate.
Ninety reviews is a moderate sample, and for a replacement part a perfect score most likely reflects the basics working: the right size arrived and it seated properly. It is not a signal that this is a premium-feel keycap.
Why the DSA Profile Matters Here
DSA uses one uniform height and a spherical top across every row. Unlike Cherry or OEM profiles, where each row has its own height and angle, a DSA cap can go on any row without you needing to match the sculpt.
For a product sold one unit at a time, that row-agnostic property is genuinely useful — you order a size, not a size plus a row.
That same property is a trade-off. If your keyboard is built with a sculpted Cherry or OEM set, a single DSA cap will sit visibly lower and flatter, and your fingertip will feel the step every time.
Dropping one in for visual consistency can backfire. DSA works best when the whole board is DSA, or when you deliberately want a key you can identify by touch.
The spherical top cradles the fingertip and reduces slipping off the edge, which most users report positively. On the other hand, the flat, uniform height can feel awkward on the top and bottom rows for some people.
This is purely a matter of preference, which is exactly why buying a single cap to try it out makes sense.
Compatibility Guide
There are only two conditions to check: the stem must be MX cross-type, and the unit width must match the position you are filling.
| Item | Spec | How to check |
|---|---|---|
| Stem | Cross-type (MX) | Fits Cherry MX, Gateron, Kailh, TTC and other MX clones |
| Profile | DSA (uniform height) | No row matching required |
| Thickness | Approx. 1.4mm | Standard to slightly thick for ABS |
| Not supported | Topre, Alps, scissor, low-profile switches | Stem geometry differs physically |
The manufacturer's compatibility note states plainly that these work only with Cherry MX-compatible switches and not with Alps, Topre, or other switch types. That rules out HHKB and REALFORCE boards, so if you are shopping for blank keycaps for an electrostatic capacitive keyboard, you need a Topre-stem key top set instead.
One more trap: MX-compatible is not the same as MX-shaped. Cherry's own MX Low Profile switches and Kailh Choc-style low-profile switches use different stem dimensions.
Assuming "mechanical keyboard equals MX" and ordering for a slim board is one of the most common keycap mistakes.
Long keys add a third condition. A 6.25u or 7u spacebar, or a 2u Shift or Backspace, depends on your board's stabilizer standard.
Cherry-style stabilizers (plate- or PCB-mounted) dominate today, but boards using Costar-style stabilizers generally cannot take Cherry-oriented caps. Confirm your stabilizer type before ordering a long key.
Installation takes seconds with a keycap puller — a wire puller is preferable. Prying caps off by hand risks damaging the stem or the switch housing, so have a puller ready before you start.
Product Info
The specifications are ABS plastic, roughly 1.4mm thick, DSA profile, black-clear color, cross-type MX stem, quantity one.
The title lists 1.25u, 1.5u, 1.75u, 2u, 2.25u, 2.75u, 6.25u and 7u, but one order delivers one cap in one selected size.
This is not a set.
The listed price was ¥973 as captured on 14 May 2026 on Amazon.co.jp.
That is ordinary for a single keycap, but prices shift with size, stock, and sales — always confirm the current figure on the product page. The eBay entry resolves only to a search results page, with no specific figure captured.
At this price point, ordering the several sizes you need in one go is usually more sensible than repeat single orders once shipping is factored in.
A word on ABS. It gloss-shines from skin oils more readily than PBT over time.
But for transparent caps this is not really a choice: PBT is inherently opaque, so clear and semi-clear caps are made from ABS or polycarbonate. The correct framing is not "clear but only ABS" — it is "clear means ABS."
How It Compares
Even within the keycap category, this product plays a different role. Against full sets like Glorious GPBT or surmen's PBT offerings — products that change the whole look of a board — this one exists to plug a single hole.
Its real competitor is not another keycap set; it is the choice between fixing one key and replacing the keyboard.
If your goal is RGB, note that this is not a shine-through design where the legend glows. It is blank and smoked, so the whole cap takes on a soft tint rather than projecting characters.
The black tint also cuts noticeably more light than a white-clear cap would. If you want bright, dramatic lighting, look elsewhere.
Best Use Cases
- Replacing one broken or lost key — spacebars and Shift keys are wasteful to buy as part of a set. Per-piece availability is the entire point.
- Owners of DSA-built boards — an extra cap matches the existing height exactly, so the build stays easy to extend.
- People easing into blank keycaps — going fully blank overnight hurts productivity; converting a few keys at a time is realistic.
- Anyone wanting a tactile landmark — a differently shaped key marks a game bind or a home reference in a dark room.
- First-time keycap swappers — at this price, learning puller technique and how much force is safe costs almost nothing.
Things to Check Before Buying
Confirm the quantity first. Because the title lists every size from 1.25u to 7u, it reads like a bundle.
The specification says one piece. If you order expecting a full set, you will be disappointed.
Write down the sizes and counts you need before checking out.
Do not over-expect the RGB effect. Black-clear is semi-transparent but tinted, so it passes less light than white-clear or fully transparent caps.
It suits a restrained, diffused glow, not maximum brightness.
Clear caps show what is underneath. Semi-transparent plastic reveals the switch housing, the plate, and every bit of dust that accumulates inside.
If you will not clean regularly, this ages worse visually than an opaque cap.
ABS shine is unavoidable. High-traffic keys develop a surface gloss within months to about a year.
There are no legends to wear off, but the texture will change — accept that or choose PBT.
Long keys hinge on stabilizers. A 6.25u or 7u spacebar will not mount unless your board's stabilizer standard and positions match.
Skipping this check is the single most repeatable keycap purchase failure.
Read the listing details carefully. Amazon product pages occasionally show size text or pricing that does not track the variation you actually selected, particularly on listings that bundle many sizes under one ASIN.
Before ordering, verify that the product image, the title, and the currently selected size all agree.
Skip this if you want a coordinated full set, premium sound and thick PBT texture, or you use a Topre or low-profile board — or if ordering caps one at a time sounds tedious. A set will serve you better.
FAQ
Q. How many caps ship?
A. One. The spec sheet says quantity 1. The sizes in the title are the variation list, not the contents.
Q. Will it fit an HHKB or REALFORCE? A.
No. Those use Topre stems, which differ from MX cross stems.
The manufacturer explicitly lists Topre and Alps as unsupported.
Q. How much RGB shows through? A.
Light passes, but the black tint mutes it compared with white-clear caps. Expect a soft overall glow, not glowing legends.
Q. Can I mix one into a Cherry-profile board? A.
It will physically fit, but the height and shape difference is clearly noticeable. Bad for visual uniformity, good as a tactile marker.
Q. Do I need tools? A.
A keycap puller is strongly recommended. A wire puller removes caps in seconds without scratching the stem or housing.
Q. How fast does ABS shine appear? A.
Depends on use and skin oils, but commonly a few months to a year on frequently pressed keys. Treat it as a consumable if that bothers you.
Product Disclosure (Amazon)
- Manufacturer: YMDK
- Seller: YMDK-JP
- Fulfilled by: YMDK-JP
- ASIN: B0DC4FSXPK
- Note: This article covers a manufacturer-made product based on Amazon listing details.
