These are what plastic tumblers USED to be. Good quality plastic,  sturdy and great looking with a little touch of retro. These replaced a set of flimsy tumblers that LEAKED at the base. You don't have to worry about that with these tumblers; they are molded in one piece. Strong too, I dropped one, and it did not crack. These may be the last plastic tumblers I need to buy, they are so good!