GMG 100% Pure Copper Moscow Mule Mug 15 Oz. Classic Solid Copper Cup with History Recipe and Cleaning Instructions. Best Metal Drinkware for your Authentic Ginger Beer and Vodka Moscow Mule Cocktail Packaging includes the original Moscow Mule recipe, as well as cleaning instructions, making this a clever and complete gift for family and friends Made with 100% pure copper (NOT copper plated or lined with metal coatings) 15 oz. content capacity  to allow for the perfect ice to drink ratio Features a tightly riveted handle, which means  no bad welds that could lead to leaks and unwanted residues Easy to clean and maintain, by simply wiping it clean with a warm damp cloth after use. Additional tarnish cleaning instructions included on packaging (which happens naturally to copper).