I use the 7150XL's on my fretless Jazz, with DiMarzio Model J's. I like them as much as the older ones. I do miss the gold color silk wraps, but other than that-I like them
D'Addario Half-Rounds are Pure Nickel, so the company does made nickel strings. I am kinda of curious about the new 7150's....the old Mexican made 7150's were great strings.