Copper Mug is constructed from 100% solid 16-gauge copper, giving it a solid hand-feel and creating a satisfying sound when set down on a table. The pair of authentic 16oz Copper Moscow Mule mugs is high quality and hand made. The copper mugs are made from 100% solid copper and are thicker than most copper mugs sold on Amazon. These Mugs have more weight to them and feel more substantial because they are made with 16 gauge solid copper. All mugs include a ,Solid Copper" maker's mark on the base letting you know each much is an original Product's Copper Mug manufactured with the high quality of care.