1. The hitting surface of the tennis racket must be flat, consisting of alternately weaving or connecting up and down the strings, and the composition format should be exactly the same. Each string must be connected to the racket frame, especially after threading, the density of the concentric center should not be less than that of any other area.
2. The total length of the frame and handle shall not exceed 81.28 cm, and the total width shall not exceed 31.35 cm. The length of the inner edge of the frame shall not exceed 39.37 cm, and the total width shall not exceed 29.2 cm.
3. The frame, handle and string should not have carvings or protrusions: there should not be any equipment that would allow the athlete to substantially change the shape of the racket
