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 320 mm recommended height from 155 cm weight strung 300 g racket balance head light stiffness 72 ra grip size l1 l5 frame material graphite shape oval length 685 cm length inches 27 technologies babolat gt babolat cortex expert babolat woofer system season 2015 series