Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 19 level advanced type of racket all round racket balance 325 mm recommended height from 155 cm weight unstrung 295 g racket balance head light stiffness 74 ra grip size l0 l5 shape oval frame profile min 38 mm frame max 38 mm length 685 cm length inches 27 technologies babolat cortex expert babolat woofer system series