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[Tumbler] Material: 18-8 Stainless steel (powder coating). [Lid, Spout] Materials: Polypropylene, Silicone. Upper temperature tolerance: 100℃/212℉ [Straw] Material: Polyethylene Upper temperature tolerance: 70℃/158℉. Keep drinks cold (7℃/45℉) for 6 hours. 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.