These are the pilsner glasses that keep beer chilled between 32° F and 36° F for 30 minutes. The double-walled glasses have a viscous cooling liquid between both layers that freezes after one hour in a freezer, enabling the glasses to chill a room-temperature libation to 36° F in just 2 1/2 minutes. The glasses are made from durable, hand-blown borosilicate glass, they each hold 13 ounces, and their slender, Pilsner-shape reveals the color and carbonation of beer while the fluted rim maintains a broad, foamy head. Hand wash. Set of Four. Each: 8 1/2" H x 3 1/2" Diam. (13 oz.)