Copper lined, vacuum-insulated deep draw liner maintains optimal drinking temperatures,18-8 Stainless Steel dual wall construction,Lead-free vacuum seal,Features a sweat-free design and 2 attachments: thumb-slide, screw-on lid and a black can/bottle ring,Twist top rubberized ring to hold a standard 12 oz. can or bottle,Transitions between poured drink insulated tumbler, 12 oz can cooler, and 12 oz beer bottle cooler,Fits in most corporate and personal coffee machines,1-year limited warranty