Wilsons Poly Pro will support you longer. The string powerful shots. The Poly Pro from Wilson is a typical polyester string with which control and solid strength development can be achieved. It assures a constant long lasting crisp playing feeling because the Poly Pro stands out for good durability. A good remedy for players who are hard on strings. Get the unbeatable advantages of a polyester string! Highlights: For the powerful player who is hard on strings. Durable Polyester strings Excellent game control and strength transmission. A great price/ Performance ratio