The wilson hyper hammer is about 6/10. I have two of them that I bought and used for about a two years. I'm asking $37.00 for each racket. The head size is 95 square inche and has a 4 1/4 grip. I am willing to trade both of the racket for one ncode six-one tour 90 with a 4 3/8 or 4 1/4 grip. Please contact me at email@example.com if interested.