Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 18 level advanced type of racket all round racket balance 325 mm recommended height from 155 cm weight unstrung 290 g racket balance head light frame material graphite shape oval frame profile min 20 mm frame max 23 mm length 686 cm length inches 27 technology prince textreme season 2015 series prince tour colour black