Made of durable, heat resistant, mouth-blown borosilicate glass of the finest quality, the MODERNA belongs to the Ozeri Artisan Series of award-winning handcrafted drink ware. Borosilicate glass is stronger than common glass, shatter-resistant and with the MODERNA"s double-walled design, it offers the ultimate insulation to maintain drinks at their ideal temperature. The MODERNA"s opposing mouth-blown dimples make for a natural and effortless grip. Each glass is made to keep your hands cool even with your hottest drinks and free of condensation with your chilled beverages. The patent-pending MODERNA is great for coffee, cappuccinos, hot or iced teas, cocktails, frozen beverages and much more. Each set contains four handmade 8 oz. glasses designed for lifetime use. The MODERNA glasses are completely dishwasher, microwave and freezer safe and ship in an elegantly printed and carefully packaged box with a 1 year warranty.