If you closely follow pro tennis, you may have noticed several players choose to use polyester strings. Pros and many advanced level tennis players opt for polyester strings for a variety of reasons, but mainly they are durable and provide lots of control and spin potential.
Because of their firm make-up polyester strings naturally are control-oriented, and the spin potential is unmatched. Many polyester strings come in a variety of shapes, which can help grip the ball for more spin. They also snap back into place reliably, and that can also help boost spin.
 
For more information about selecting rackets and strings click the link below:
https://www.youtube.com/watch?v=_LqxZt9k5gM