These fit lots of smaller square cards including: Among the Stars, Cat Box, Catan Card Game, Codenames (square cards), Euphoria: Build a Better Dystopia, Fields of Green, King of Tokyo: Halloween, Munchkin Apocalypse, Power Grid, Tiny Epic Galaxies Beyond the Black (round cards), Viceroy and World Without End.
* Contains 55 card sleeves.
* These are 100 microns thick, significantly thicker than the standard variant.