100% Pure Solid Copper Moscow Mule Mug - 16 Oz Capacity Premium 16 oz 100% Copper Mug. Each Mug is Handcrafted by skilled coppersmiths. PURE COPPER with no lining or coatings to provide health benefits of beverages consumed from copper. This Mule is the Best Value on Amazon. This Mule is one of the Best Values in America. Substantial Heirloom Quality Mug with Extra Large Handles. Perfect for elegant entertaining or providing extra health benefits. The copper will age but can be easily polished to bring back the rich luster.