Moscow Mule 100 % Solid Pure Copper Mug /Cup (16-ounce/set of 4, Hammered, Nickel Lined)- Saint Jacques Solid Copper construction with beautiful handcrafted hammered finish, Nickel lined, and cast brass handle Perfect for moscow mules, beer and other cold beverages Preferred by bartenders, 16 ounce Capacity Hassle free returns through Amazon Hand wash only - dishwashers are too abrasive to the finish of the mugs