Adult tennis racket head size midplus racket head size 639 cm head size inches 99 sq in stringing 16 x 15 level professional type of racket tournament racket playing properties spin balance 330 mm recommended height from 155 cm weight unstrung 290 g racket balance even grip size l1 l4 shape oval frame profile min 24 mm frame max 24 mm length 686 cm length inches 27 technologies wilson spin effect technology wilson amplifeel 3