MX Xxxxx key caps

Wondered about this, a way to mark your boards fast and clearly

So either MX letters or
Black on mx-blue stem colored key:

White? on mx-black stem colored key:


White(or something else, black is too dark for brown) on mx-brown stem colored key:


Black on mx-red stem colored key:

Black on mx-white stem colored key:


Would get these if I get someone to compare the samples with stems. About 20 packets, 5 keys each, 3-5$ for all+shipping...