The Moscow Mule is a classic cocktail that's recently become one of the most popular cocktails in America. And the vodka that bartenders said they turn to more than any other when mixing this fantastic drink is Ketel One. So we worked with Ketel One to design the ideal Mule mug. Made of hand-pounded copper, the curved mug is modeled after the original copper still in Holland where Ketel One is made. It's the ideal vessel for serving a Mule.