Moscow Mule Hammered Copper 18 Ounce Drinking Mug, Set of 4 With Ice Ball Maker 100% PURE COPPER FOOD GRADE--No nickel or stainless steel, Pure Food Grade Copper. These mugs are the real deal--drink the moscow mule the way it was meant to be enjoyed, with a handcrafted pure hammered copper mug. ICE COLD--Our copper mug will frost up in mere seconds. The pure copper transmits an icy cold experience directly to your lips, and the metal locks in the drink's coolness. Drink In Style - copper Mugs Available with one set of Ice Ball Maker. Surprise your friends and family with cool ice balls in their drinks which can last for hours, while keeping the drinks cold-not diluted Enter yourself with copper mugs and Ice Ball Maker in the world of Moscow Mules