Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 19 levels professional advanced type of racket all round racket balance 320 mm recommended height from 155 cm weight unstrung 300 g racket balance head light stiffness 70 ra grip size l0 l5 frame material graphite shape oval length 685 cm length inches 27 technologies babolat evo beam babolat x sider babolat response woofer bab