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Q: how can they copy damascus?

Well they can use a process called etching, which can imitate the look of it. Etching is a process that can be done on metal by acid and an electric charge. But the issue with that is that they copy the look of it not the strength or quality of it.

Q: I’m a large in US sizing, which should I choose??

I ordered as a gift for my grandson who wears men's M, and that's the size I ordered. He doesn't live near me so I've actually never seen it on but I believe it fit fine.