The height of each column of keycaps is not exactly the same, for most mechanical keyboards, from the side to view the height of the keycaps, you will find that the tilt angle of each column are slightly different, mainly will be concave, so that typing up to reduce the burden on the hands. Membrane keyboards are almost always flat on the sides, but a few will have a height design like mechanical keyboards.

A keycap from the F area (is F1 that horizontal row) down each row height is different, usually to r, r2, r3, r4, etc. named. This arrangement height everyone usually to r1 keycap arrangement height: a keycap from the F area (that is, F1 that horizontal row) down each row of different heights, usually named r1, r2, r3, r4 and so on. r2r3r4 for a simple naming, and then this arrangement height, each manufacturer with each manufacturer is not the same. In general, are commonly used by manufacturers to arrange the height of the prevailing.

From the top of the keyboard count to the bottom will have a total of 6 columns, tilt angle from top to bottom usually for R4, R4, R3, R2, R1, R1, some keycaps will be turned over to see these notes. As for there is a higher R5 height, which is extremely rare in the current keyboard. In addition, some players for keyboard tilt height is the reverse narrative, from top to bottom into R1, R1, R2, R3, R4, R4, although the number is different, but the meaning of the representative is not different.

Remove the keycaps of the mechanical keyboard, from top to bottom are R4, R4, R3, R2, R1, R1. In other words, a keyboard will have 4 tilt angles.

• R1: R1 height refers to the height of the keycaps in the row of Ctrl Win space and the row of Shift and letter Z.
• R2: R2 height refers to the height of the A keycap
• R3: The height of R3 refers to the height of the Q row of keycaps
• R4: R4 height refers to the height of the keycaps in the row of symbols ~ and numbers and Esc and F

The height of each row of keycaps, as well as the tilt of the keycap surface and the direction of the tilt are different, so that the user's hands will be more comfortable during typing.