Old Dutch 2P401 Moscow Mule Mug, 24 oz, Copper While these mugs were designed with Moscow Mules in mind, they're utterly suitable for serving beer, soda or other cold libations, of course These made-to-last mugs feature a coating of resilient lacquer that resists tarnishing for lasting appeal Double-walled: Solid Copper and 18/8 Stainless Steel