YONEX Polytour Pro 120 17 Gauge Polyester Tennis String Set (Flash

Arm-friendly with a comfortable feel. The thinner gauge creates more spin potential. Durable, world class string with comfortable feel to reduce player fatigue. Stretched under controlled temperature, Yonex strings deliver greater durability, reduced fatigue, and consistent repulsion. Offering surprising performance in a durable string, Yonex Poly Tour Pro Tennis Racquet String provides greater playability than Poly Tour HS. The increased elasticity is thanks to a unique blend of polymers during construction to allow both strength and flexibility