Magnum Steel is the premium drinkware line for professionally insulated cups. The Magnum Steel Jacket Can & Bottle Insulator keeps cans and bottles cold to the final last sip. It fits most bottles and cans and holds up to 12oz. It is great for Tailgating, Camping, Hiking, BBQ parties, Cookouts and Pool Parties. Made of 18/18 Stainless Steel – Double Wall Vacuum Insulated Thermos.