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 drinkware.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 240ml 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.