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 bought these for a Christmas present for my daughter and her husband. They are guaranteed to keep drinks cold and, from what I've been told, they really, really do the job. And they're beautiful too! I plan on buying them the rest of the set