Indicates that the racket is a fake or a high imitation.

Nowadays, the racket shaft and the taper at the front of the handle have laser-engraved factory numbers, that is, double steel numbers. What is on the handle is the product serial number, which is different for each racket; The cone is the product batch number, and the same batch of products has the same batch number. The two English letters at the end of the batch number represent the sales area, and mainland China is CH. Existing counterfeit rackets also have steel numbers, but some are printed on them, while others are different from the real ones in the details of the fonts. However, the early rackets only had a product batch number with deeper and thicker strokes on the tapered handle (commonly known as a single steel number). If it is a real racket, then its letters must be deep and clearly visible. If the steel number letters are not clear, it can be seen that it is a fake.