Adult tennis racket head size oversize racket head size 742 cm head size inches 115 sq in stringing 16 x 20 level beginner type of racket all round racket playing properties comfort balance 350 mm weight unstrung 255 g racket balance head heavy stiffness 69 ra grip size l0 l4 frame material graphite shape oval frame profile min 26 mm frame max 26 mm length 70 cm length inches 28 technologies babolat woofer system babolat co