PURE COPPER FOOD GRADE--No nickel or stainless steel, Pure Food Grade Copper. These mugs are the real deal--drink the moscow mule the way it was meant to be enjoyed, with a handcrafted pure copper mug Our copper mug will frost up in mere seconds. The pure copper transmits an icy cold experience directly to your lips, and the metal locks in the drink's coolness. The inside of the mugs is unlined and made from 100% pure copper, so some oxidation may take place, we recommend using any copper cleaner cream to keep your mugs looking like new. Made of pure Copper, Comes with a Small Copper Cleaning Powder Packet Capacity - 16 OZ of each mug , Outer Side Hand Painted and Water Resistance Washable Paint Can Use As , Vodka, Wine , Juice, Cold Drink , Cocktail , Cold Coffee Mug Solid Copper Mug Not Lining . Useful in Only Cold Drink , Not for Hot Drink 16 OZ CAPACITY HAS NUMEROUS USES--Our Copper Mug works great for chilled beer, iced coffee, iced tea and any vodka, gin, rum, tequila, or whiskey mixed drinks. Additionally, many experts tout the benefits of drinking water from 100% copper drink ware.