Wilson NXT Power - Another good alternative to Natural Gut, available in two gauges. Slightly thicker than the original NXT, NXT Power still features high crystallinity xycro microfibers bonded with polyurethane for an ideal combination of soft feel and explosive power upon contact. Originally labeled NXT Tour, this string's softness and comfort are about as close as it comes to natural gut. NXT Power features a 15% larger sweet spot and 80% less vibration than traditional synthetic gut string. The thinner 17 gauge will offer more power and feel, but less durability than the 16 gauge. For installation, handle gently and avoid over-clamping and crimping. Wilson NXT 17/1.26 Tennis String (Natural) Specs: Gauge: 17 Diameter: 1.26 mm. Construction: Multifilament Composition: Xyrco Micro Fibers / PU Shape: Round Colour: Natural Length: 40 ft. / 12.2 m. Made in France Product Code: WRZ941700 Wilson NXT Power 16/1.30 Tennis String Specs: Gauge: 16 Diameter: 1.30 mm. Construction: Multifilament Composition: Xycro Micro fibers bonded with polyurethane Shape: Round Colour: Natural Length: 40 ft. / 12.2 m. Made in France Product Code: WRZ941600