The Wilson Hyper Hammer 145 incorporates Power Holes technology for more power & an increased sweet spot. It is fitted with a 75.6in 2 (488cm 2) head & has a string pattern of 12 x 20. The racket is head heavy balanced for more stability & spin & comes strung with a Sensation Strike string. The Hyper Hammer 145 is perfect for hard hitting players searching for great control. It weighs 145g (5.1oz) & comes with a 3/4 cover for protection.