Wilson NXT Power 17g Reel 660' - NaturalWilson NXT Power 17g Reel 660' Natural NXT Power features high crystallinity xycro microfibers bonded with polyurethane for an ideal combination of soft feel and explosive power upon contact. It's been rated as the #1 comfort string by USRSA, and it features a 15% larger sweet spot and 80% less vibration than traditional synthetic gut string. The core is composed of a ribbon like co polymer, which increases its tensile strength and reduces the amount