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We love these great tumblers. They are light weight and easy to hold/store in your vehicle's drink holders. These stainless steel drink tumblers are vacuum insulated to keep your favorite hot beverages hot for up to 5 hours and your favorite cold beverages cold for up to 50 hours. The double wall construction keeps the outside free of any sweat. All tumblers are BPA-free. The lids are designed to be shatterproof.