Adult tennis racket head size midplus racket head size 645 cm head size inches 100 sq in stringing 16 x 19 levels professional advanced type of racket all round racket playing properties comfort balance 325 mm recommended height from 155 cm weight unstrung 285 g racket balance head light grip size l1 l3 frame material graphite shape oval frame profile min 22 mm frame max 26 mm length 685 cm length inches 27 technologies yo