Moscow Mule Copper Mugs - Copper Mugs Hammered, Mule Mug Thick and Solid Stainless Stain Lining With A Copper Plated Exterior Beauty Hammered Finish Which Gives The Copper Mug A Touch Of Class Full 20 ounces Is The Perfect Size For Moscow Mule Keep Drinks Ice Cold For An Extened Period Of Time. One Year Warranty by Celehome