Moscow Mule Hammered Antique Copper Mug - 12 oz Crafted out of hammered antique copper plating onto a stainless steel base. Hard, stainless steel foundation resists damage, thus extending the practical life of the mug. The Moscow Mule was invented in the early 40s by a liquor distributor trying to move cases of vodka. Copper mugs are essential for proper authentic presentation. Dimensions: 3 1/4"H; Capacity: 12 oz.