No.8, No.7 and No.6 are all middle and high-grade badminton suitable for beginners, and they are all made of duck feathers. The wool quality of No.8 ball is slightly worse, No.6 ball is slightly better, and No.7 ball is in the middle. In terms of hitting resistance, the 8 th ball is slightly worse, and the 7 th ball is basically the same as the 6 th ball; In terms of flight stability and ball feeling, the same No.8 ball is slightly worse, No.6 ball is slightly better, and No.7 ball is in the middle. In terms of price, the eighth ball is around 65 yuan, the seventh ball is around 75 yuan, and the sixth ball is around 80 yuan.