Materials: 18-8 Stainless steel (powder coating) Copolyester, Silicone. BPA Free. Upper temperature torelance: 100℃/212℉. Dishwasher safe. Keep drinks hot (70℃/158℉) for 1 hour. Keep drinks cold (10℃/50℉) for 5 hours. For maximum insulation efficiency, preheat or pre-cool the tumbler prior to use by filling in a bit of hot/cold water for 1-2 mins. Do not use in a microwave or oven. Do not place near open flames. When using a dishwasher, please store them in the upper basket to avoid force and weight applied to them. Keep out of reach of children. Do not drop or subject the product to strong impact as it may cause breakage or leakage. Be careful not to pour too much beverage as it may overflow when closing.