18-8 Stainless Steel dual-walled construction Vacuum-insulation maintains optimal drinking temperatures and provides 6X heat retention Lead-free in all accessible components Transitions between poured drink insulated tumbler, 12 oz can cooler, and 12 oz beer bottle cooler Features 2 attachments: clear screw-on, sip-through lid and a black can/bottle ring Twist top rubberized ring to hold a standard 12 oz. can or bottle Fits in most corporate and personal coffee machines 1-year limited warranty