Haus by Kalorik Double Wall Glass tumblers, Clear, 8.5 Ounce (Set of 2) SET: Includes two 8.5 oz double walled glass tumblers. DURABLE: Constructed of super strong borosilicate glass. INSULATING: Double wall keeps cold drinks cold and hot drinks hot while staying cool to the touch. SAFE: Easily and safely use in both the dishwasher and microwave for easy use and easy clean. TRUSTED: Haus by Kalorik is backed by a 6 month manufacturers warranty.