Tried something new and failed. I guess my power and spin combination was to much for these strings. Had them loaded at 58 lbs. and hit with them for about an hour and then played a match. The strings were all over the place and I didn't feel any "pop" off of them especially on my serve. I am merely a recreational player with a 3.5 USTA rating who has only been playing for two years, but I will not go back to synthetic Gut anytime soon.