100% COPPER HAMMERED MUG BARRELS - No nickel, tin, or other metals on copper mug barrels in order to provide the authentic Moscow Mule experience and taste.;PERFECT SIZE & WEIGHT - Each mug is 16 oz. in size in accordance with the Moscow Mule legend. Not too large nor too small. Experience the solid feel of a tip-top solid copper mug.;RIVETLESS INTERIOR FROM CUTTING-EDGE TECH - Rivets, which require holes to mount the handle, may leak over time. Nozdrovia utilizes cutting-edge metal bonding technology to achieve a rivetless seam.;LIFETIME HAPPINESS PROMISE - We believe so strongly in our quality that we offer a Lifetime Happiness Promise. Return the mug anytime, for any reason, for a full refund, with no questions asked.;MONEY BACK GUARANTEE - If you don't love your Nozdrovia mugs, you won't pay for them!