The main materials of common tennis strings nowadays are Kevlar, polyester fiber, nylon and natural catgut. Tennis strings made of different materials can withstand different pounds of string. For example, the catgut string favored by professional players has a wide range of applicable pounds.

1. Kevlar fiber is one of the greatest inventions in material science in the 20th century after the invention of nylon. It is a new type of carbon material made by polymerizing carbon elements. Its biggest feature is that it is harder than steel. The density is comparable to fiberglass.

It was originally used to make body armor, and its biggest advantage is its super toughness and shock-absorbing capabilities. Later it was used in the production of tennis rackets and strings. This kind of string is relatively hard, so the tennis racket string weight can be slightly lower.

2. Polyester thread is another kind of durable ball string material, and it has been accepted by more and more people. In fact, the first generation polyester thread is like an iron plate, and it loses weight quickly. The second generation polyester thread combines Other materials, the string itself is softened and adds to the ball feel. The feel of the ball is improved compared to the first generation polyester ball, and the ability to maintain pounds is also improved, but it is still their weakness.

There are two types of third-generation polyester threads. They use synthetic polyester multifilament structure to improve the ball feel. They still use the traditional single-core structure, but the feel is softer and solves the problem of weight loss. This kind of thread is also relatively hard, but compared to Kevlar thread, it is softer. Therefore, the poundage of tennis racket stringing depends on your original habits. 3. Nylon thread is the most widely used material nowadays. It is popular because it is not afraid of moisture, is wear-resistant, can be mass-produced and is reasonably priced. This kind of string is easier to lose weight, so the weight of the tennis racket string can be slightly higher.

4. Catgut first appeared in the early 1800s. It often becomes the choice of professional players. The history of catgut dates back almost to the beginning of tennis, with the first batch of catgut produced by the Babolat company in 1875. The material source of natural catgut is the chorion of cow intestine. Sheep is the most primitive source of catgut. Why is the thread made from cow intestine still called catgut? This is because people have long been accustomed to the name catgut. Why is catgut so expensive? The production process of natural catgut is extremely complex, and it takes the chorion of three cows to produce one tennis string.