The Cerano 22 oz Vacuum Insulated Tumbler with Cork Base is made of 18/8 stainless steel with a powder-coated matte finish and is copper-lined with double-wall insulation. Comes with a plastic, push top lid and an accent of cork (30% cork & 70% TPE) at the base. Bottom is 100% PP. Keeps beverages hot for up to 8 hours and cold for up to 12 hours. Hand wash only and do not put in microwave or freezer. Must be ordered in exact case quantities and may ship from CA location. FDA certified.