The wilson hyper hammer 145 incorporates power holes technology for more power and an increased sweet spot it is fitted with a 756in2 488cm2 head and has a string pattern of 12 x 20 the racket is head heavy balanced for more stability and spin and comes strung with a sensation strike string the hyper hammer 145 is perfect for hard hitting players searching for great control it weighs 145g 51oz and comes with a 34 cover for protection