A fellow bassist from an orchestra I was playing in recently gave me his extra gut strings and some are long E's for an extension that are copper/nickel wrapped. He switched to steel strings in the 70s and these were the leftovers he had that were unused. Does anyone have any experience or know anyone who played/plays on these strings? I found pictures of orchestra bass sections in the 40s who had the mechanical extensions and I assume they were using strings like these. The brands of strings are Artone and Roth.