The Li-Ning 3D Calibar 300 Badminton Racquet is built on the 3D Calibar Technology Platform and features a high-tech, geometric badminton racquet frame design. It produces faster swing speeds for bigger smashes and gains outstanding reviews from strong players looking for maximum power. The badminton rackets are suitable for fast players skilled in switching quickly between offense and defense. The 3D Caliber Technology Platform uses a 3-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. 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. Does the racket come with a cover? No, the Li-Ning 3D Calibar 300 Badminton Racket doesn’t come with a cover.