Old Dutch 2-Ounce Solid Copper Moscow Mule Shot Mugs, Set of 8 (OS418) These diminutive shot mugs hold just 2oz. of liquid. These are not our regular sized Moscow Mule Mugs. Solid Copper Construction with nickel lining and solid Brass Handles. Tarnish resistant lacquer preserves the beauty and luster of the copper, requires no polishing.