Solinco Tour Bite 18g Tennis String (Reel) is a newly developed, high-performance and versatile polyester string designed to generate extreme power and intense spin and bite. Tour Bite utilizes an innovative, high-powered polyester monofilament fiber designed and shaped to generate maximum power while amplifying the spin and bite intensity of the ball. Features: Composition - Co-Polyester Gauge -18g/(1.15mm) Length - 656’/200 m Type - Monofilament PolyesterSolinco Tour Bite 18g Tennis String (Reel) is designed to generate extreme power and intense spin and bite.