Stainless Steel
It is made of food-grade 304 stainless steel. Stainless Steel Coffee Tumbler is firm, Rustproof, No harm to human health, and without metallic taste.40oz Insulated tumbler has a vacuum double wall design which ensures good insulation. No matter which season you are in, you can enjoy your favorite hot and cold drinks for a long time keeping hot drinks hot for up to 12 hours and cold for 34 hours.
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