Use thickened glass to make the cup stronger to support higher and lower tempreture. Use glass straw, durable and more healthy. All parts are Lead-free and BPA/BPS free.The tumbler except the cap is top rack dishwasher-safe.Do not microwave.Do not freeze. Keep your fingers safe and cool with heat resistant and double wall glassware, so beverages stay warm without you getting burnt!the outside surface always feels comfortable in hand. Keeps cold drinks and hot drinks longer with double wall and screw on lid.Size 6 inch height,3.2 inch caliber wide with slid and 6.8 inch length glass straw. This glass set is packaged in the heavy bubble holder and thick carton box to prevent damage while in transport.