Keycap materials and profiles

Keycaps are the part of the keyboard your fingers actually touch. They change the texture, the sound, and whether the letters fade or the surface goes shiny over time. Swapping caps is the easiest way to change how a board looks and feels without touching the switches.

The two plastics: ABS and PBT

ABS

The original keycap plastic. It is smooth and easy to make in bright colors, but it goes shiny over time as your fingers polish it, often within a few months on the most-used keys. Most keycaps that come with prebuilt keyboards are thin ABS.

A smoother feel and a slightly higher-pitched, clackier sound.
Thicker premium ABS sounds much deeper than the thin stock kind.
It will eventually shine. You can delay it, but not avoid it.

PBT

A harder, slightly textured plastic. It resists shine basically forever and has a deeper, more muted sound. This is the usual choice for nicer aftermarket keycaps.

A slightly rough, grippy texture that many people prefer, especially with sweaty hands.
A lower, deeper sound, often described as thocky.
Colors are a touch less vivid than ABS, but it lasts much longer.

	ABS	PBT
Feel	Smooth, slippery once worn	Textured, grippy
Goes shiny	Yes, over months	Basically never
Sound	Higher, clackier	Deeper, thockier
Colors	Very vivid	Good, slightly muted
Found on	Stock prebuilt caps, premium GMK sets	Most enthusiast aftermarket sets

How the letters are made

This matters because cheaper methods let the letters rub off over time. Here are the common ones, from most to least durable.

Doubleshot: The letter is a separate piece of plastic molded into the cap, so it can never wear off. Common on premium caps.
Dye-sublimation: The letter is dyed into the surface of a PBT cap. It will not wear off, but it only works as darker letters on lighter caps.
Pad printing or laser etching: The cheapest method. The letter is printed or burned onto the surface and can rub off, sometimes within months. Found on bargain keyboards.
Shine-through: The letter is a clear cutout so the keyboard's lighting glows through it. Almost every gaming keyboard uses this.

Profile: the shape of the caps

Profile means how tall the caps are and how they curve. Some sets are sculpted, where each row is shaped a bit differently, and some are uniform, where every cap is the same. This changes the typing feel more than most people expect.

Sculpted profiles (rows shaped differently)

OEM: What comes on most keyboards. Medium height, gently sculpted, comfortable and familiar.
Cherry: A bit shorter than OEM and a longtime enthusiast favorite. Most premium sets use it. A small, comfortable upgrade from OEM.
SA: Very tall and retro-looking, with a rounded dish. Distinctive and fun, but slower to type on at first.
MT3: Tall with a deep dish your fingers settle into. Very comfortable once you adjust.

Uniform profiles (every cap the same)

XDA: Uniform height with wide, flat tops and a clean, modern look.
DSA: Like XDA but shorter. Smooth and low, common on smaller keyboards.

Tip

If you have only ever used the stock OEM caps, try Cherry profile first. It is the smallest change for the biggest payoff. Taller profiles like SA and MT3 feel odd for about a week before you get used to them.

Sizes and layouts to watch for

Keys come in sizes measured in units. A normal letter key is 1u. The big keys like spacebar, shift, and enter are wider, and some keyboards use unusual sizes.
ANSI vs ISO: these are two layouts with a differently shaped enter key. Make sure a keycap set matches your layout before buying.

Buying caps for a board you own

Check your layout (ANSI or ISO) and size (60%, 65%, 75%, TKL, or full), and note any oddly sized keys.
Check the stem. Almost all caps fit standard switches, but low-profile keyboards need special low-profile caps.
Pick a material: PBT to last, ABS for the deepest colors.
Pick a profile: Cherry for most people, OEM if you do not want any adjustment period.
Pick a colorway, the fun part. In-stock sets ship now; fancy custom sets can take many months to arrive.