These Stainless Steel Beverage Holders feature double-wall, vacuum insulation. They feature superior heat and cold retention and are made to fit the new taller, thinner beverage cans. Simply screw off the rubber top, place your beverage inside and replace the top! Please select either the slim size or standard size can cooler. These are laser engraved for permanent etching. Dishwashing is not recommended due to the vacuum insulation layer.