Wilson NXT 16 Tennis Racquet String (16 Gauge, 1.30mm) 16-gauge racquet string for increasing sweet spot and reducing vibration Rated #1 synthetic gut for playability and comfort by USRSA Dual-wrap DuPont Xycro microfibers bonded with polyurethane coating Increases racquet's sweet spot by 10 percent; reduces vibration by up to 74 percent Package includes 40 feet of string; ideal for any racquet