These fit inside 10 oz, 20 oz, and 30 oz Ozarks. I haven't tried them inside anything else. I also didn't try to attach them to my turner arm. I'm a little curious how well they will fit into the smaller tumblers with a turner arm through them. I'm also curious to see how long before they deform, since they are still just foam. They are, however, a more dense foam than pool noodles, so they should last longer before collapsing.