Adult tennis racket head size midsize racket head size 613 cm head size inches 95 sq in stringing 16 x 19 level professional type of racket tournament racket balance 305 mm recommended height from 155 cm weight unstrung 320 g racket balance head light frame material graphite shape oval frame profile min 19 mm frame max 22 mm length 686 cm length inches 27 technology prince textreme season 2015 series prince tour colour bla