This long-lasting, high-power polyester string retains performance with minimal drop even after the punishing impact from big swings. Yonex Poly Tour Strike in Iron Gray lets aggressive players attack with confidence knowing their strings won t lose tension when they need it most. Poly Tour Strike is the string of choice for 2 time grand slam champion Naomi Osaka and tour star Denis Shapovalov.Gauge: 16G (1.30 mm) | 16L (1.25 mm) | 17G (1.20 mm)Length: 39 ft (12 m)Composition: Co-polyester MonofilamentColor: Iron Gray For more info on the Yonex String, click the links below:Yonex: Strings and ThingsA Meeting with Mark Gonzalez: Yonex Australian Open Stringer and Texas RepNeed help selceting the right string? Check out our Buyer's Guide for more assistance.