Adult tennis racket head size oversize racket head size 677 cm head size inches 105 sq in stringing 16 x 19 type of racket comfort racket playing properties comfort control power balance 330 mm recommended height from 155 cm weight unstrung 280 g racket balance even grip size l0 l5 shape oval frame profile min 23 mm frame max 26 mm length 692 cm length inches 27 technologies prince exo prince textreme season 2016 series