Rabbit Freezable Whiskey Glasses (Clear/Black, Set of 2) These double-walled glasses contain a liquid that can be chilled to below freezing, cooling beverages quickly from the inside out. Perfect for whiskey or bourbon, these drinking glasses are ready for use after just one hour in the freezer. A silicone base keeps the glass from slipping and reduces condensation. Each glass can hold up to 8 ounces, suitable for a wide range of adult beverages. These glasses should be hand-washed only; wash with warm water and a mild detergent and then let dry.