Made from food-grade 304 (18/8) stainless steel, this tumbler can take a knock or two without damage. At 16oz and suitable for every kind of beverage, these cups will hold hot coffee on your morning commute, ice tea on a family picnic or even champagne for an impromptu celebration. Stainless steel is the ideal material for a tumbler as it doesn't affect the taste of your beverage and is free from BPA, lead and other toxins. With a double-wall vacuum design, these cups keep drinks warm or cold for up to 3 hours (tip: rechill your cup or fill with ice to extend cooling time). These tumblers are dishwasher safe. Do not microwave. Lid is not designed to be leak-proof. The bottom of the cup is 3.5 in so it may not fit in some cup holders.