This Yonex Poly Tour Spin is a shaped, low powered, monofilament polyester string ideal for big-hitting baseliners. It constructed from pentagonal shaped monofilament polyester. It helps offer superior levels of spin potential by giving the ball an extra bite. The low powered nature of the string allows players to take bigger, faster swings at the ball without fear of over hitting and losing control. Get great precision and control with lots of power and access to effects.