Big round roly poly tumblers, 70s vintage Anchor Hocking, Milano pattern. These are 3 1/4" x 3 1/4", what I think is called an 8 ounce glass, though these will hold 10 ounces.
It's a set of eight glasses, all in excellent condition. So cool for a retro bar, or as stemless wine glasses in a mid-century modern table setting!