Material: 18-8 Stainless steel (powder coating) [Lid, Spout] Materials: Polypropylene, Silicone Upper temperature torelance: 100℃/212℉ [Straw] Material: Polyethylene Upper temperature torelance: 70℃/158℉Keep drinks cold (7℃/45℉) for 6hours. For maximum insulation efficiency, precool the tumbler prior to use by filling in a bit of cold water for 1-2 mins. Made in China This is a tumbler for cold drinks. Do not use in a microwave. Do not use in a dishwasher. Do not place near open flames. Do not put in boiling water. Do not drop or subject the product to strong impact as it may cause breakage or leakage. Keep an eye on your children when they use this tumbler. Be careful with infants as their mischiefs may cause accidental ingestion or injury. Do not put hot drinks as it may cause scalds. Do not put dry ice or carbonated beverage as it may expand and cause breakage. Be careful not to pour too much beverage as it may overflow when closing. Close the lid tightly to prevent spills or leakage when carrying. Please attach silicone rings so that the right side is up. Ensure the straw is inserted to the back. Do not tilt the product too much when drinking with a straw, as the drink remains at the bottom corner. Keep the product upright to prevent accidental spills or leakage. Do not shake or apply strong vibration to the tumbler, as it may cause the leakage from the tip of the spout due to changes in internal pressure. Wash with care. Do not use abrasive cleansers or steel wool. Do not remove the spout forcibly. When rust spots are found inside the tumbler, add warm water and citric acid in ratio of 10:1, wash with soft sponge after leaving it for 2-3 hours, and rinse well.