Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 20 level advanced type of racket all round racket balance 345 mm recommended height from 155 cm weight strung 265 g weight unstrung 255 g racket balance even stiffness 71 ra grip size l0 l4 frame material graphite shape oval length 685 cm length inches 27 technologies babolat cortex expert babolat woofer system series babo