Adult tennis racket head size oversize racket head size 774 cm head size inches 120 sq in stringing 16 x 19 level beginner type of racket comfort racket playing properties comfort control power balance 355 mm weight unstrung 255 g racket balance head heavy grip size l0 l5 shape oval frame profile min 26 mm frame max 30 mm length 705 cm length inches 28 technologies prince exo prince textreme season 2016 series prince pr