Custom Tumblers & Travel Mugs, York 20 oz Stainless Steel Polypropylene Tumbler with Cork Base - 3Hr Insulation & BPA Free, Stainless steel outer with black polypropylene inner lining Decorative cork base is 90% cork & 10% polypropylene Keeps beverages hot or cold for up to 3 hours Clear plastic push-on lid with sliding drink opening Item should not be put in the microwave or freezer Hand wash only BPA Free and FDA certified ... #DTM-YK19 $6.91/each.