Adult tennis racket head size oversize racket head size 658 cm head size inches 102 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 racket balance even grip size l0 l5 shape oval frame profile min 24 mm frame max 24 mm length 685 cm length inches 27 technologies head youtek head innegra tm technology season 2015 series head radical