Adult tennis racket head size midplus racket head size 632 cm head size inches 98 sq in stringing 16 x 19 level professional type of racket tournament racket playing properties comfort control power spin balance 320 mm recommended height from 155 cm weight unstrung 305 g grip circumference 109 111 mm racket balance head light stiffness 70 ra grip size l3 frame material graphite shape oval length 685 cm length inches 27 season