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 335 mm recommended height from 155 cm weight unstrung 270 g racket balance head heavy grip size l0 l5 frame material graphite shape oval frame profile min 24 mm frame max 26 mm length 685 cm length inches 27 technology head innegra tm technology season 2016 serie