Hammered Copper Moscow Mule Barrel Mug 14oz Double Stainless Steel Lining Beautiful Handcrafted 14oz Hammered Vintage Barrel Copper Plated with Double Wall Stainless Steel Construction - Keeps your drink ice cold! Stainless Steel will last longer than traditional 100% Copper Mugs. Good for both hot and cold beverages. Not safe with microwave or dishwasher use.