Adult tennis racket head size oversize racket head size 658 cm head size inches 102 sq in stringing 18 x 19 level advanced type of racket all round racket balance 360 mm recommended height from 155 cm weight unstrung 245 g grip circumference 103 105 mm racket balance head heavy grip size l1 frame material titanium shape oval frame profile min 24 mm frame max 25 mm length 695 cm length inches 27 series head titanium