Keycap Profiles & Materials Compared
The keycap is the only part of a keyboard that a typist physically touches, yet it is often the last component new builders consider. Profile height, sculpting angle and plastic composition each affect typing comfort, acoustics and long-term durability in measurable ways.
Understanding Profiles
A keycap profile describes the shape and height of the cap as well as whether each row is sculpted to a different angle. Sculpted profiles guide fingers into a natural curve across the rows, while uniform profiles keep every key at the same height and angle — useful for unconventional layouts like ortholinear or split boards.
Cherry Profile
Cherry profile is a low-to-medium height sculpted design that originated with Cherry Corporation. The rows have a gentle slope, which keeps fingers close to the plate and reduces wrist extension. It is the most common profile shipped with stock keyboards and aftermarket sets alike.
- Height: approximately 9.4 mm on row 1 (spacebar), 7.3 mm on row 3 (home row)
- Sculpted: yes, cylindrical top
- Best for: standard staggered layouts, typists who prefer low-profile feel
SA Profile
SA (Spherical All) caps are tall and heavily sculpted with a spherical dish on each key. The extra height creates a deeper sound signature and a retro aesthetic reminiscent of vintage terminal keyboards. Typing on SA requires more finger travel, which some users find fatiguing over extended periods.
- Height: roughly 14.9 mm on the tallest row
- Sculpted: yes, spherical top
- Best for: typists who enjoy high-profile keys, display builds
DSA Profile
DSA is a uniform, medium-height profile with a spherical top. Because every row is the same height and angle, DSA sets can be freely rearranged across rows without visual or functional mismatch — a practical advantage for Dvorak, Colemak or custom layouts.
- Height: approximately 7.6 mm, uniform across all rows
- Sculpted: no (uniform)
- Best for: ortholinear boards, layout experimenters
MT3 Profile
Designed by Matt3o and manufactured by Drop, MT3 combines the tall height of SA with a deeper spherical dish and more aggressive row sculpting. Users often describe the feel as similar to typing on an IBM Selectric — each finger falls naturally into a concave well.
- Height: comparable to SA but with a deeper scoop
- Sculpted: yes, deeply spherical
- Best for: typists transitioning from vintage keyboards, those who prefer deep key wells
Materials: ABS vs PBT
ABS (Acrylonitrile Butadiene Styrene)
ABS is the most widely used keycap plastic. It moulds easily, accepts vibrant dye-sublimation and doubleshot legend techniques, and produces a higher-pitched sound on bottom-out. The main drawback is that ABS develops a visible shine on frequently-used keys within a few months of heavy typing.
PBT (Polybutylene Terephthalate)
PBT is denser and more resistant to wear. The textured surface retains its matte feel far longer than ABS, and the material is less prone to yellowing under UV exposure. PBT keycaps tend to produce a deeper, quieter sound. The trade-off is cost — PBT sets typically run SGD 40–80 more than comparable ABS sets — and the material can warp during manufacturing, especially on longer keys like spacebars.
Doubleshot vs Dye-Sub Legends
Doubleshot keycaps are moulded in two layers of plastic so the legend can never fade or wear away. Dye-sublimation prints the legend by diffusing ink into the plastic at high temperature; the result is slightly less crisp than doubleshot on dark-on-light sets, but modern dye-sub quality has narrowed the gap considerably.
When evaluating a keycap set, check whether the spacebar is included and straight. PBT spacebars are notorious for arriving with a slight bow. A quick test: place the spacebar upside down on a flat surface. If it rocks, a short stint under a heat lamp at 60–70 °C with weight on top usually corrects the warp.
Where to Buy in Singapore
iLumkb and Kibou.store carry a rotating selection of keycap sets that ship from local warehouses. For group-buy extras, the SG MechKeys Telegram channel often has members selling opened-but-unused sets at close to retail. International storefronts like Drop, KBDfans and NK Creams ship to Singapore, though duties may apply on orders above SGD 400.