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 285 g racket balance head light grip size l1 l4 frame material graphite shape oval frame profile min 23 mm frame max 25 mm length 685 cm length inches 27 technologies tecnifibre synergylink tecnifibre velocity sha