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. Currently used by WTA player, Maria Kirilenko, Poly Tour Pro offers improved ball pocketing and comfort compared to many of the poly-based strings tested. An outer coating is applied to reduce friction, increasing spin generation for excellent control from the baseline. Construction: Co-polyester monofilament