Hot Cold Double Wall 18/8 Stainless Steel Vacuum Insulated, Thermal Tumbler 12 oz. - Gray 12oz. Double Wall 18/8 Stainless Steel Vacuum Insulated Thermal Tumbler. Enjoy up to 2 hrs Hot or 4 hrs Cold use. 18/8 Stainless Outer & Inner Wall. MatteBlack Finish painted exterior and rubber skid grip base. Threaded lid, with Flip Up drink spout. Locks securely in place to prevent spillage. Dimensions: 2.5 Hand Wash Recommended, due to Individual Dishwasher Temperature and Abrasiveness Variations that may cause damage to the exterior paint finish and plastic components of the tumbler.