Adult tennis racket head size midsize 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 power recommended height from 155 cm weight unstrung 300 g racket balance even grip size l1 l4 shape oval frame profile min 23 mm frame max 26 mm length 685 cm length inches 27 technologies head graphenext head asp adaptive string pattern season 2015 c