Whether you like your martini shaken or stirred, the glass martini freeze cooling glass keeps drinks at the optimal temperature. The active cooling gel inside the double-walled glass provides thermal insulation keeping drinks chilled at all times. Each glass is constructed with an insulated silicone band for comfortable handling. Quantity: 2 glasses capacity: 9 oz. Material: glass with insulated silicone grip care: hand wash for the best results, place the martini freeze upside down in the freezer for 2 hours to allow the gel to evenly spread and freeze. Host's beverage accessories are developed through meticulous testing and revision for uniquely functional items designed to keep drinks colder, longer.