Bodum Rigi Stacking Double-Wall 8-Ounce Thermo Glasses, Set of 2 Set of 2 stacking Rigi glasses in 8-ounce size Mouth-blown of exceptionally clear, lightweight, borosilicate thermal glass Double walls eliminate condensation while keeping drinks hot or cold Stackable and space-saving; 11- and 15-ounce sizes also available Safe for dishwasher and microwave use