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 balance 340 mm recommended height from 155 cm weight unstrung 260 g grip circumference 103 105 mm racket balance even stiffness 73 ra grip size l1 frame materials graphite tungsten shape oval frame profile min 22 mm frame max 26 mm length 685 cm length inches 27 technol