Why use Pure Copper? Pure copper is essential for the chemical ionization of acids found in citrus fruits such as limes, lemons, and oranges. For this reason, other mugs that have stainless steel linings or are coated with food lacquer or nickel do NOT have the same taste as drinking from a pure copper mug, we take great pride in the authenticity and craftsmanship of our products. Your new Moscow Mule mug is made from 100% copper without any lining. Don't drink from a cheap imitation--you deserve better. Free Copper Shot Glass We've created the perfect mug for all of your cocktail and drinking needs, but we didn't stop there. With your purchase of the copper mug we'll include a FREE 100% copper shot glass! Not only is this shot glass sleek and shiny, it allows you to create your cocktails in pure copper, giving your drink a head-start on the ionization process and making it extra delicious Classic Moscow Mule Recipe 6 oz. ginger beer 2 oz. vodka Half a lime Pour the ginger beer and vodka over a generous amount of ice cubes. Squeeze the lime into the mix and stir. Add lime slice for garnish.