True. It's a shot in the dark most of the time, but you can get a little closer if it's US made. My main hammer is a 32 oz Craftsman ball pien that I reshaped, but I got too soft and have to dress the face often. I was assuming it to be S7 steel and to be air hardening steel. It may be, but I did something a little bit wrong anyway. What ever you do gables, wear eye protection while working these hammers. Lin