18-8 Stainless Steel dual-walled construction, Vacuum-insulation maintains optimal 6X drinking temperatures, Lead-free in all accessible components, 3-in-1 design 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