Our hand-hammered copper mules are the perfect drink companion. Each mule holds a generous 16 ounces of your choice of chilled beverage, namely the Classic Moscow Mule Cocktail. Copper keeps drinks ice cold for a longer period of time compared to glass mugs. To ensure comfortable consumption Copper Moscow Mules have always been recommended for use with chilled beverages only, as the copper will conduct heat. Copper is not lacquered and will develop a natural patina. Food safe.