16 oz Stainless Steel Tumbler. 16 oz. double-walled 18/8 stainless steel tumbler has a twist open Sovranoâ„¢ lid with drinking spout and non-slip base pad. Patent US D569, 181 S. Finish / Material: 18/8 Stainless Steel, Polypropylene. Insulated Double Wall Body. Rotating Closure.BPA Free.