Head graphenext pwr instinct tennis racket boost your power with the head graphenext pwr instinct tennis racket it has been manufactured with graphenext which is the strongest but lightest material to provide you with optimum weight distribution for a faster swing and more power to enhance your peformance head graphenext pwr instinct tennis racket weight unstrung 225g beam 29mm length 703mm string pattern 1619 head size 740cm2 115in2 balance unstrung 380mm recomme