I used these strings when I accidently bought them and picked up the wrong pack. It was a great mistake. I really enjoy the pain free playing I had and the 17 gauge strings had great spin potential. Like all 17 gauge, they do break easily if you play with them all the time. I play USTA and ALTA and I have did try other strings but I always tend ti come back to this one. I do wish the strings were a little cheaper.