The T-shaped racket is a patented technology used in YONEX badminton rackets. It is a T-shaped part installed at the joint between the middle pole and the racket frame. The full name is "T-JOINT BUILT IN". The purpose It is to improve the stability and anti-torsion performance of the racket body. The U represents the weight of the racket, which usually has a mark such as 3U-G4. It is usually attached to the handle. If not, you can weigh the racket to determine how many u it is. Generally, 3u is 85-89g 0