Old Dutch International, Purveyors of the ORIGINAL MOSCOW MULE MUG, 100% Pure Copper, Unlined Moscow Mule Mug, 16-Ounce 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 it's bright, shiny look Guaranteed to be free of manufacturing defects, simply return the item through the return process for a free replacement Beware! a Number of unscrupulous sellers are offering low quality counterfeit versions of our Moscow mule mugs . To insure youre getting genuine Old Dutch (family owned and run since 1950) Moscow mule mugs purchase only from itself or MMP LLC.