Pure Copper Moscow Mule Mug | Handcrafted Hammered Copper Drinking Mug | 16oz | No Nickel Lining 100% Solid Copper HANDCRAFTED: Culinary Pro Collection Hammered Copper Mugs are handcrafted and are guaranteed to last a lifetime. All mugs purchased from JSM Global automatically receive this warranty. WHY COPPER? Aside from looks alone, copper actually helps insulate your drink as the copper quckly takes the the temperature of the ice. This means drinks stay colder longer! Copper can also add a earthy flavor to the cocktail. MOSCOW MULE: Our copper mugs are the perfect size (16oz) for your Moscow Mule (also known as a Vodka Buck). We have even printed our favorite Moscow Mule recipe right on the box. NO LINING: Culinary Pro Collection Pure Copper Mugs are just that, Pure copper coated in a food grade lacquer (to prevent tarnishing) We actually cut one in half for you to see, just check out the product images. NO RIVITS: Copper handles on our mug are bonded to the exterior of the mug. There are no holes in the mug which means NO LEAKS!