These are bases compatible with Lego, used for playing Star Wars Legion games.

At present, I have attached the base sizes of 27 mm and 50 mm, and I will add larger sizes in the future.

These are part of the Lego head and parts sets, and I'm making these sets so that my children can use Lego characters to try to play the Star Wars Legion game.

https://www.printables.com/social/90982-ian-foulds/collections/394300