Keychron OEM Retro Keycap size

K2 OEM Keycap Size

K4 OEM Keycap Size

Keychron K4 Version 2 Keyboard Keycap Size High-rest

K6 OEM Keycap Size

K8 OEM Keycap Size

K12 OEM Keycap Size

Keychron K12 60% compact wireless mechanical keyboard keycap size