Utilitarian ear covers that fit most Korg modules such as the modwave, wavestate, opsix, and multi/poly.  These snap on the ends of the metal ears to prevent them from scratching other gear that may be on the desktop.

Version 1 was my sizing prototype. The prototype worked well enough that I decided to just use it instead of spending more time on it.  Months later, I wanted to reprint in black so I made version 2 with rounded edges and make minor tweaks to the size.  This version fits perfectly and locks in place.