Junior tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 19 levels professional advanced type of racket all round racket balance 330 mm recommended height 140 155 cm weight unstrung 235 g grip circumference 100 102 mm racket balance even stiffness 64 ra grip size l0 shape oval frame profile min 23 mm frame max 26 mm length 66 cm length inches 26 season 2015 player dominik