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 Guaranteed hassle free returns through Amazon Hand wash only - Mugs have a protective coating to prevent tarnishing. Mild dish solution may be used for cleaning. Do not place in dishwasher