Adult tennis racket head size oversize racket head size 658 cm head size inches 102 sq in stringing 16 x 19 level advanced type of racket all round racket playing properties power spin balance 320 mm recommended height from 155 cm weight unstrung 270 g racket balance head light stiffness 70 ra grip size l1 l4 frame material graphite shape oval length 685 cm length inches 27 technology babolat woofer system series babolat game