PFU HHKB Professionalシリーズキートップセット英語配列中央印字蒲公英 PD-KB400KTLYC

This article covers the PFU HHKB Professionalシリーズ キートップセット 英語配列 中央印字 蒲公英 PD-KB400KTLYC — a first-party accessory that changes how your HHKB looks without replacing the keyboard itself.

Overview

PFU's HHKB Professional Series Keycap Set, English Layout, Center Print, Dandelion (PD-KB400KTLYC) is the third installment in the Color Keycap Project, made specifically for Happy Hacking Keyboard Professional series users. The theme is dandelion: warm yellow keycaps with center-positioned legends that evoke spring sunlight.

The set includes all 60 keycaps needed for a full English-layout HHKB Professional keyboard, plus a keycap puller and an instruction manual.

The bottom line first: this is for people who already own an English-layout HHKB Professional, are happy with how it types, and are tired of how it looks. For anyone else there is little reason to buy it.

Nothing about the electrostatic capacitive switches, the sound, or the feel changes. What changes is the impression the board makes on your desk.

The appeal is visual play and flexibility. Go all-yellow for a bold look, or swap only a handful of keys as accents.

With the included puller, a full swap takes a short session. White (Snow) and Ink (black) center-print sets are sold separately, so mixing sets lets you build a layout nobody else has.

Note that center printing itself is a big visual change: standard HHKB legends sit in the upper-left corner, so moving them to the center makes the same keyboard read as a different product.

Spec Summary

Sixty keys is exactly what an English-layout HHKB Professional needs, so you can do a complete swap the day it arrives with nothing missing. The flip side is that there are no spares — lose or crack one and you are back to the original cap for that key.

The material is listed only as "plastic," which may frustrate buyers who care whether it is PBT or ABS; check the product page if that detail matters to you.

Compatibility Guide

This keycap set is exclusively for English-layout HHKB Professional series keyboards. Compatible models include HHKB Professional BT, HHKB Professional HYBRID Type-S, and HHKB Professional HYBRID.

It is not compatible with the Japanese-layout HHKB Professional JP or HHKB Professional JP Type-S — the JIS layout differs in both key count and key shapes, so there is no workaround.

The biggest trap is the HHKB Studio series. Studio uses mechanical switches, so the stem shape under each cap is different from the electrostatic capacitive Professional series.

"It's an HHKB, so it should fit" does not hold. Before buying, confirm two things: that your board is a Professional series model, and that it is English layout.

The quickest physical check is the area around the spacebar — an English layout is close to symmetric, while a JIS board has conversion keys flanking it.

One compatibility point people forget is the interaction with HHKB DIP switch settings. You can remap things like Delete and BackSpace behavior in hardware, but the legends printed on the caps are obviously fixed.

If you have changed those settings, the legend and the actual input will disagree. Center-printed legends are more visually prominent than corner ones, so that mismatch may bother you more than it used to.

Touch typists will never notice; people who glance down will.

The swap itself is not hard. Place the puller squarely on the cap and pull straight up.

Pulling at an angle risks damaging the stem, so keep it vertical. A full 60-key swap runs about 30 minutes for a first-timer.

While the caps are off, it is worth vacuuming or brushing the dust out of the board.

Product Info

As captured on June 30, 2026, the Amazon.co.jp listing price was ¥8,250.

A later capture on August 26, 2026 showed the same ¥8,250, suggesting a stable price band. Keyboard accessories still move with sales and stock, so check the product page for the current price before ordering.

The eBay side returned only "See listing" with no concrete figure, so this article makes no claims about overseas pricing.

On review data: as of the June 30, 2026 capture, the listing showed 47 reviews at 4.9 out of 5 stars (98% positive).

Forty-seven reviews is a reasonable sample for a niche first-party accessory, but it is small next to mass-market products, so treat 4.9 as a soft signal rather than a guarantee.

It also helps that only HHKB owners buy this — buyer intent and product purpose line up almost perfectly, which tends to produce high scores.

Positioning: this is a niche first-party accessory for one keyboard family. Third-party PBT sets often ship 100+ keys for a few thousand yen, so 60 keys at ¥8,250 (June 2026 capture) can look expensive.

What you pay for is a guaranteed fit on HHKB's capacitive switches and legends whose position and typeface match PFU's own design language — things third-party sets cannot replicate.

Compared to Alternatives

The same center-print line includes an Ink (black) variant, PD-KB400KTBC, which is the restrained choice. If you do not want your keyboard standing out in an office, pick Ink; if you want a desk accent, pick this Dandelion set.

Buying both and swapping a subset of keys is very much an intended use of the series.

Generic mechanical keycap sets (Cherry/MX compatible) are not really competitors — they physically cannot mount on HHKB Professional capacitive switches, and this set cannot mount on an MX board. If you arrived here simply searching for "keycaps," confirm your switch type first.

Practical Uses

Beyond a full swap, there is a functional angle. Color-coding only the keys you reach for most — Esc, Control, Shift — makes them findable at a glance.

That has real value if you are still learning HHKB's unusual layout rather than being purely decorative.

Also: keep the original caps. Being able to revert, whether for resale or because the yellow got old, changes how the purchase feels.

A small zip bag inside the keyboard's box is enough.

Best Use Cases

HHKB Professional owners who want a fresh look. Years of the same monochrome board get stale.

This set transforms the appearance in one session and suits anyone matching a desk accent or a room palette.

First-time keycap swappers. The included puller and instructions mean no extra tool purchase.

A full swap takes time but the steps are simple and the failure risk is low — a gentle entry point into keyboard customization.

People planning to keep their HHKB for years. ¥8,250 (June 2026 capture) is not cheap in isolation, but it is far less than replacing the keyboard.

As a way to refresh a board you will use for several more years, the math is reasonable.

It is not for HHKB Studio owners, Japanese-layout owners, or anyone hoping to improve typing feel. The first two cannot mount it at all; the third will not get what they want.

Things to Consider

Check your model and layout strictly. As noted, this does not work with HHKB Studio, and it is English layout only — JIS owners cannot use it.

Getting this wrong means a return process that costs you time.

This product changes aesthetics only, not feel. If you want different key travel or sound, look at o-rings or moving to a Type-S model instead.

The hope that ¥8,250 buys a better typing experience will be flatly disappointed, and you should accept that before ordering.

PFU does not sell individual keys from this set, so partial color schemes require buying the white or Ink sets separately. There are no spares in a 60-key set either — lose or damage one during the swap and that key stays original.

Work over a desk, ideally on a mat so nothing rolls away.

On legend durability: the exact printing process is not something this article can state with certainty from the available data. In general, keycap legends wear first on the most-used keys.

There is no data here to promise how many years these legends last, so check PFU's product information if long-term wear matters to you — and treat confident claims in reviews as reflecting someone else's usage conditions, not yours.

Finally, about listing metadata. E-commerce pages sometimes carry manufacturer names, model numbers, or compatibility lists that disagree with the actual product.

For a product where the wrong model means it simply will not fit, that is serious. Before buying, verify with your own eyes — in the product images, the title, and PFU's official information — that you are looking at model PD-KB400KTLYC for the English-layout Professional series.

Assume the compatibility list on a listing page could be wrong.

FAQ

Q. Does it fit HHKB Professional JP (Japanese layout)?
A. No. This is English layout only; JIS boards differ in key count and shapes.

Q. Does it fit HHKB Studio?
A. No. Studio uses a different switch type with a different stem shape.

Q. How long does a swap take?
A. About 30 minutes for all 60 keys if it is your first time, using only the included puller.

Q. Does it change typing feel?
A. No. It is purely cosmetic. For feel, look at o-rings or a different model.

Q. Can I buy a single key?
A. Individual keys are not sold. For partial color changes, buy another set (white or Ink) and mix.

Q. What does it cost? A.

Captures on June 30, 2026 and August 26, 2026 both showed ¥8,250 on Amazon.co.jp.

Prices change, so confirm on the product page.

Product Disclosure (Amazon)

• Manufacturer: HHKB
• Seller: PFUダイレクト
• Fulfilled by: PFUダイレクト
• ASIN: B0DV58CP6J
• Note: This article covers a manufacturer-made product based on Amazon listing details.