Meet the world's most popular multifilament string. The Wilson NXT 17 features proprietary xycro microfibers impregnated with PU for incredible comfort and feel. Its X-bonded core increases tension maintenance and power, so players can generate great pace on the ball. Sporting a 10% larger sweet spot than traditional synthetic gut string and a fraction of its shock, NXT has stood the test of time. This 17 gauge string is slightly thicker than the 16 gauge, which extends durability. For installation, handle gently and avoid over-clamping and crimping.