The original American Mule Mug is made with 100% copper. Purity is crucial, not just to the signature look and feel of this cocktail classic, but also to the taste. When combined with spicy ginger beer, quality vodka, and fresh lime juice, the copper adds the perfect amount of acidity, giving the drink a smooth and delicious balance that’s kept sophisticated tipplers coming back since it was first poured in the 1940's.