Powder coated stainless steel 22 oz double wall tumbler with a cork bottom. The cup's built-in cork bottom serves as a coaster and prevents the cup from sliding around on smooth surfaces. Keep drinks hot for up to 8 hours and cold for up to 12 hours. This item does not contain any BPA, phthalates, lead, or other harmful chemicals. They are constructed of food-grade materials that have been FDA-approved and passed California Proposition 65. Must be sold in lots of 25.