I would have suspected a dud if I had only bought one of these, but after going through five or six in total, I can definitely say there is something wrong with the construction of this particular string. There were a lot of unwanted bell-like/ringmod-like overtones on all of them (tried on 570, 643 and 650 mm scale lengths). Luckily, once the string gets a bit dirty that character is subdued, but if you're recording and need to use new strings every session, this is probably not a good string to use.