I restrung my P Bass with Ernie Ball Cobalts 2 weeks ago. We had an afternoon gig (it is bikeweek down here in FL) and I broke the G string right in half. I have had an old string break at the bridge before, I rarely break strings...but this sucker is 2 weeks old. I never carry a backup, but had the set that came off so at least string was precut and ready to go. The last set of Cobalts lasted me about 4 months. From now on I am carrying a backup.