Adult tennis racket head size oversize racket head size 729 cm head size inches 117 sq in stringing 16 x 19 level beginner type of racket comfort racket balance 360 mm recommended height from 155 cm weight unstrung 258 g racket balance head heavy grip size l1 l4 frame material carbon shape oval frame profile min 26 mm frame max 26 mm length 699 cm length inches 27 technologies wilson triad technology wilson amplifeel 360 wil