Sun's Tea (TM) 13oz Strong Double Wall Old-Fashioned Thermo Whiskey/coffee/juice Glasses, Set of 2 Set of two Sun's Tea (TM) 13oz non-fragile double wall glasses. (No plastic part) Made of non-fragile laboratory rate borosilicate glass, passed freefall ice ball impact test from 16 inches height. Air insulated in the unique double wall struture keeps cold drinks cold and hot drinks hot, the outside surface always feels comfortable in hand. Dishwasher and microwave-safe. Hand washable with easy using Sun's Tea Push&Pull brush This high quality glass is perfect to use in the home or office. Warranty info available at manufacture web site