Big Sky Carvers Copper Moscow Mule Mug is spun of solid copper and the distinctive Bear Track carved in the side of the mug. The 16 ounce mug stands 4" high and has a 4.5" diameter. The plain mug design is a classic for serving iced cocktails such as the Moscow Mule, a blend of vodka, ginger beer and lime juice, but they can be used for any iced beverage. The copper helps keep cocktails and other refreshments well chilled. Not recommended for hot beverages. The Moscow Mule recipe is included on the gift box. Wash in hot, soapy water and dry immediately with a towel. Copper is a very malleable metal, very vulnerable to scratching. Do not use steel wool. Copper polish can be used to keep the mug exterior looking new, or a combination of lemon and salt.