Wilson NXT power is engineered from high crystallinity Xycro Micro Fibre, ensuring great feel and power on the court. To understand just how much power its possible to generate on a shot, you need to experience the Wilson NXT Power tennis racket string. Featuring high crystallinity Xycro Fibre, it gives great punch to your shots, and is a straightforward way to up your power game. High crystallinity Xycro Fibre for optimal feel and power.Length 40 feet 12.2 meters.Gauge 17 gauge 1.26mm.Colour 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 of tension lost while hitting shots. Originally labeled NXT Tour, this string's softness and comfort are about as close as it comes to natural gut. This 17 gauge string is slightly thicker than the 16 gauge, which makes it a more durable option. Plays the closest to Natural Gut of any synthetic string - provides the biggest sweetspot of all NXT strings. The 17 gauge will provide more bite (spin) , comfort and less durability than the 16 gauge. • Softest feel and highest performance