1.4. 1 The size, shape and weight of the racket are not limited, but the bottom plate should be flat and hard.
1.4.2 The thickness of the bottom plate should be at least 85% of the natural wood, and the adhesive layer for strengthening the bottom plate can be made of fiber materials such as carbon fiber, glass fiber or compressed paper, and each adhesive layer should not exceed 7.5% or 0.35 mm of the total thickness of the bottom plate.
1.4.3 The racket face used for hitting the ball should be covered with a layer of ordinary granular glue with outward particles, and the thickness of the glue should not exceed 2mm or covered with sponge glue with inward or outward particles, together with adhesive, and the thickness should not exceed 4 mm.
1.4.3. 1 "Ordinary granular rubber" is a layer of natural rubber or synthetic rubber without foam, and its particles must be distributed on the whole surface, with an average density of not less than 10/cm2 and not more than 50 particles.
1.4.3.2 "Sponge rubber" means that a layer of foam rubber is covered with a layer of ordinary granular rubber, and the thickness of ordinary granular rubber is less than 2mm.
1.4.4 The covering should cover the whole racket face, but not beyond its edge. The portion near the handle and the finger grip portion may not be covered, or may be covered with any material.
1.4.5 The bottom plate, any interlayer, covering layer and adhesive layer in the bottom plate shall be a whole with uniform thickness.
1.4.6 Both sides of the racket, whether covered or not, must be dull, one bright red and the other black. The edge of the racket should be blunt, not white.
1.4.7 Due to accidental damage, wear or fading, the integrity and color consistency of the racket face are slightly different. It can be used as long as the racket face performance has not changed significantly.
1.4.8 When an athlete needs to change his racket at the beginning and during the competition, he must show his opponent and the referee the racket he will use and allow them to check it.