York 20 oz Stainless Steel/Polypropylene Tumbler with Cork Base features double-wall insulated 18/8 stainless steel construction, with polypropylene/plastic inner wall, that keeps beverages hot or cold for up to 3 hours, and clear plastic push-on lid with sliding drink opening. The decorative cork base is 90% cork & 10% polypropylene. Item should not be put in the microwave or freezer. Hand wash only. BPA Free and FDA compliant