Moscow Mule 100 % Solid Pure Copper Mug /Cup (16-ounce/set of 4, Smooth, Nickel Lined)- Saint Jacques Solid copper construction with beautiful handcrafted smooth finish, Nickel-lining, and cast brass handle Perfect for moscow mules, beer and other cold beverages Preferred by bartenders. 16 ounce Capacity. Hand wash recommended Hassle free returns through Amazon