Zak Designs Disco Clear 16-Ounce Double Old Fashioned, Set of 4 Set of 4 Disco Clear 16-ounce double old fashioned drinkware by Zak Designs Made of strong, styrene copolymer; ideal for outdoor use Square cuts catch light and intensify colors within Mix and match Disco colors and sizes to create a custom look Dishwasher-safe in top rack; not suitable for microwave use