Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 18 levels professional advanced type of racket all round racket balance 320 mm recommended height from 155 cm weight unstrung 275 g racket balance head light grip size l0 l4 frame material graphite shape oval frame profile min 22 mm frame max 26 mm length 686 cm length inches 27 technology prince textreme season 2016 s