Their premium plastic drink ware, etched with the rationalization of your choice, is impact and shatter resistant with glass-like brilliance. This set is great for indoor or outdoor entertaining; you will be amazed by the quality of this virtually unbreakable, glass-like drinkware. Made of 100% BPA-free Tritan™ copolyester, they are dishwasher safe, freezer safe and temperature resistant up to boiling point. This space-saving drinkware stacks without sticking and inhibits water pooling on the bottom.