The Tumbler Lid turns any 8oz, 16oz and 20oz Insulated Tumbler and 16oz and 20oz Steel Pint into a perfect to-go cup. The splash-resistant press fit lid has an easy to clean design with removable silicone gasket. Tumbler lid is made from BPA-free polypropylene #5 and is dishwasher safe. NOTE: Tumbler Lid is NOT leakproof.