Zak Designs Triangle Turquoise 18-1/2-ounce Beverage/Cooler Tumbler, Set of 4 Set of 4 Triangle Turquoise 18-1/2-ounce beverage/cooler tumblers Made of strong, styrene copolymer; ideal for outdoor use Clear triangular base catches color from glowing sides Substantial weight has sophisticated look and feel Dishwasher-safe in the top rack; not suitable for microwave use