These 16 oz mugs Copper mugs are awesome. Clearly you have discovered how good a Moscow Mule is in one. Now you should have these mugs at home. I recently purchased a second set to have more on hand for gatherings. The original set have held up for years of service. With hand washing the nickel has not warn and the copper still looks good. If you prefer the copper to be shinny, and I do, occasionally use some "Bar Keepers Friend" on them and they shine up quick.
I originally bought these for myself and ended up ordering more to give as gifts! The mugs are amazing quality and what makes them giftable is the fact that Old Dutch sends them all in individual boxes. I paired 2 of these mugs with a bottle of Dented Brink Vodka and some ginger beer, my friends loved it.