Adult tennis racket head size midplus racket head size 632 cm head size inches 98 sq in stringing 16 x 19 level professional type of racket tournament racket balance 320 mm recommended height from 155 cm weight unstrung 305 g racket balance head light stiffness 70 ra grip size l1 l5 frame material graphite shape oval length 685 cm length inches 27 technologies babolat evo beam babolat response woofer babolat x sider babolat stabil