They’re just membrane keyboards encased in cheap ... [ipee9932cd] did what any of us would do and made a custom case out of the heaviest, most widely available casting material: concrete.
After a few dark decades of membrane keyboards being the norm ... It starts with a PCB and on-board controller, and the idea is to customize it from there. You’re left to 3D print, laser ...
The best mechanical keyboards offer a level of satisfaction that is unmatched by the regular membrane keyboards ... 8MB profile storage for saving 6 custom macro keys as well as backlight playback.