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 310 mm recommended height from 155 cm weight unstrung 310 g racket balance head light grip size l2 l4 shape oval frame profile min 19 mm frame max 24 mm length 685 cm length inches 27 season 2016 series yonex ezone dr colours grey yellow