One thing to tell you, the stainless or silver lining, wears off on the first use. Kinda ooky, as I don't want to consume whatever it is. That said, and after its gone, it's just a copper mug. It has stayed super shiny and polished on the outside so far, I do hand wash everything. The size is great, nice and big, the biggest I found(reasonably). Overall happy with these. Would buy again despite the silver lining:)