Patented design. Double-wall 18/8 grade stainless steel construction. Rust proof stainless steel outer. Lid doubles as a cup, is made of double-wall stainless steel and can hold 8 fluid ounces. Durable handle. Stanley lifetime warranty. Manufactured By Leeds. Note: Instructions Included: No Materials: 18/8 GradeStainlessSteel Oz Capacity: 35.0