The ch on the racket represents products sold or manufactured in China, while sp represents products manufactured or sold in Singapore. To identify whether a racket is genuine or fake, you don’t have to look at this! It mainly depends on its craftsmanship, for example: whether the paint is sprayed several times (because YY's spray paint is generally not sprayed once, but is completed several times. You can touch it by touching the frame with your hands. It comes out, and imitation shots basically can’t feel the concave and convex feeling), the color of the bottom buckle of the racket and whether the thread buckle is neat and consistent, etc. Generally, YY rackets are easy to identify. In addition, when buying a racket, don't try to buy it cheaply. You should still buy it in a specialty store. You can check the authenticity online. There is also the price. Generally, sellers can make a profit on auctions with a discount of 40% or more, and they are generally not fake. The discount is very low, it must be fake, and the seller basically cannot get the goods. Furthermore, people who play golf frequently usually have their own place to buy rackets. Ask him to take you there (someone you know and is safe) or recommend a place where you can buy rackets safely. The above is my opinion. If you have any questions, you can contact me.