Old Dutch International, Purveyors of the ORIGINAL MOSCOW MULE MUG, 16-Ounce Solid Copper Moscow Mule Mug with Flat Handle The 'Original Moscow Mule Mug', SOLID COPPER CONSTRUCTION with a Smooth Finish Unlined Interior and unlacquered Exterior, 16 oz. Capacity True to its roots, our solid copper original Moscow Mule mug offers the performance and reliability the others just can't match Unlacquered finish will age to a pleasing patina, or, if you prefer it can be polished to retain its bright, shiny look Guaranteed to be free of Manufacturing Defects, simply return the item through the Amazon return process for a free replacement Beware! A number of unscrupulous sellers are offering low quality counterfeit versions of our Moscow Mule mugs on Amazon. To insure youre getting genuine Old Dutch (family owned and run since 1950) Moscow Mule Mugs purchase ONLY from Amazon itself or MMP LLC.