Adult tennis racket head size midplus racket head size 632 cm head size inches 98 sq in stringing 16 x 19 level professional type of racket tournament racket balance 340 mm recommended height from 155 cm weight unstrung 265 g racket balance even grip size l0 l5 shape oval frame profile min 23 mm frame max 25 mm length 695 cm length inches 27 technology head graphenext season 2015 series head ultimate speed additional info