Wilson's premiere multifilament synthetic gut, NXT Tour is designed to offer both power and comfort with its gut like feel. Wilson gives this string its maximum playability rating and also scores NXT Tour high for durability. Construction: Multifilament Xycro Micro fibers bonded with polyurethane. Gauge: 16 / 1.30 mm. Length: 40 feet / 12.2 m. Color: Natural.