Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 19 level advanced type of racket all round racket playing properties control power balance 330 mm recommended height from 155 cm weight unstrung 270 g racket balance even stiffness 72 ra grip size l0 l4 frame material graphite shape oval frame profile min 23 mm frame max 26 mm length 685 cm length inches 27 technologie