Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 14 x 16 level advanced type of racket all round racket balance 330 mm recommended height from 155 cm weight unstrung 290 g racket balance even grip size l0 l5 frame material graphite shape oval length 687 cm length inches 27 season 2014 series prince exo 3