As someone that love Krosmaster (and doesn't get enough time to play it), I needed some base rings to tell my characters from my opponents. I've also seen some friends play with multiples of the same character, so these are also to help differentiate between them.

These just snap right on. The hole in the bottom makes for easy removal.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/fyGBoC4mC3G