Stainless Steel Lined Copper Mule Mugs are drinking cups typically used to serve the popular cocktail, Moscow Mule. These mugs have a copper exterior with a stainless steel interior lining, providing a functional and stylish way to enjoy your favorite beverages. The combination of copper and stainless steel creates a durable and long-lasting product, while the hammered or smooth finish adds a touch of elegance to any occasion. The mugs often feature a sturdy handle and hold around 16 ounces of liquid.