Single-strand tennis string has good durability and low price. However, this kind of tennis string has a general feel, and the pounds are easy to decay. It is suggested to add 3-5 pounds when stringing this tennis string to compensate for the loss of pounds.

Polyester string polyester is another durable ball string material, which is wrapped with a layer of polyethylene material outside many nylon strings to make them integrated. Nowadays, more and more professional players have used the strings made of this material. However, the polyethylene material itself loses its elasticity faster than other artificial strings, so it is often used by leisure players mixed with Kevela strings.