Adult tennis racket head size midsize racket head size 645 cm head size inches 100 sq in stringing 16 x 19 balance 330 mm recommended height from 155 cm weight unstrung 275 g racket balance even grip size l0 l5 frame material graphite shape oval frame profile min 23 mm frame max 23 mm length 685 cm length inches 27 technology head metallix season 2017 series head spark line colour black additional information the offers