PURE COPPER FOOD GRADE--No nickel or stainless steel, Pure Food Grade Copper. These mugs are the real deal--drink the Moscow mule the way it was meant to be enjoyed, with a handcrafted pure copper mug Our copper mug will frost up in mere seconds. The pure copper transmits an icy cold experience directly to your lips, and the metal locks in the drink's coolness. The inside of the mugs is unlined and made from pure copper, so some oxidation may take place, we recommend using any copper cleaner cream to keep your mugs looking like new. These Hammered Copper Mugs will really stand out in your kitchen and impress your friends. The shiny copper exterior glimmers wherever it is placed, and it's the perfect staple for the host or party-thrower. These mugs are externally lacquered to maintain the luster and last a long time unlike other mugs. Beautiful yet functional! Hand Wash Recommended. FREE COPPER SHOT GLASS--Included with your purchase is a Copper Shot Glass! The beautifully-crafted shot glass lets you make your drinks in style. 16 OZ CAPACITY HAS NUMEROUS USES--Our Copper Mug works great for chilled beer, iced coffee, iced tea and any vodka, gin, rum, tequila, or whiskey mixed drinks. Additionally, many experts tout the benefits of drinking water from copper drink ware.