The Yonex Poly Tour Pro Tennis String delivers powerful shots, high durability, prolonged repulsion power, comfortable feel and reduces player fatigue.Yonex Poly Tour Pro has a monofilament core, which is made with high polymer polyester. During manufacturing, it is extended under controlled temperature, making the string stronger to strain misfortune, and expanding durability and consistency, while maintaining its energy transfer characteristic. The soft feel of the string makes it comfortable to play with, and less vibration levels and duration.Senior players Maria Kirilenko and Richard Berankis use the Poly Tour Pro String. Maria remarked,The Poly Tour Pro string enables me to inconvenience my rival with extraordinary spin. It encourages me play with great aggression.Yonex designed Poly Tour Pro for big hitters with an assaulting, aggressive style of play. This incorporates players searching for a softer feeling poly that holds tension and has included durability, and those searching for a spin friendly string that enables them to rip the ball with confidence.