The first time I used the racket, the bottom knob came off. This has happened on 3 of 4 rack. Have tried to get along with the seller, regarding compensation, but we will not agree. . I think the seller should start gluing and taping of rackete. Had I bought them in the store I had left them back at one time and asked for the money back. Now I want to either have new racket or my money back.