The Li-Ning Turbo Charging 75 EX badminton racquet promises fast-paced gameplay. It embodies high-tech badminton technology. It is highly efficient and aerodynamic. The badminton racket uses a unique trapezoidal frame construction which allows you to generate strong and fast swing motions and return the shuttlecock with ease and grace like the professionals. The Turbo Charging Technology Platform in the racket uses a 2-digit numbering system. The first digit determines the grade of the racquet as follows: If the first digit is 1, 2 or 3, the racquet is suitable for beginners. If the first digit is 4, 5 or 6, the racquet is suitable for intermediate players. If the first digit is 7, 8 or 9, the racquet is suitable for advanced players. Technology Used: Turbo Charging Trapezoidal Frame: The Turbo Charging series Racquets come with a Trapezoidal Frame construction that cuts through air seamlessly to reduce the drag coefficient of the Racquet for extra-strong swing speeds. TB-Nano Binding: Nanometer Technology combines carbon fiber and resin tightly. This provides unmatched elasticity, stability, and durability in every strike. Stabilized Torsion Angle: Turbo Charging Racquets are engineered with Stabilized Torsion Angle technology to improve the torsion resistance of the Racquet by manifolds, enabling you to strike, smash, and attack seamlessly. About Li-Ning: Li-Ning Company Limited is a Chinese sportswear and sports equipment company founded by former Olympic gymnast Li Ning. The company endorses a number of athletes and teams worldwide. Is the racket unstrung? Yes, the Li-Ning Turbo Charging 75 EX Badminton Racket is an unstrung badminton racket.