This is the stainless steel drinkware that helps maintain the original temperature of chilled beverages. In tests by the Hammacher Schlemmer Institute, the glasses' dual stainless steel walls prevented ice from melting 45-105 minutes longer than single-wall plastic, ceramic, or glass cups. The 18-8 stainless steel will never break like glass and won't develop bacteria-harboring pits or cracks like plastic. The 12-oz. capacity cups have a brushed exterior and weigh only 8 oz. each for practical, everyday use. Dishwasher safe. Set of Four. Each: 5 1/2" H x 2 3/4" Diam. (8 oz.)