Adult tennis racket head size oversize racket head size 710 cm head size inches 110 sq in stringing 16 x 19 level beginner type of racket comfort racket balance 345 mm recommended height from 155 cm weight unstrung 265 g racket balance even grip size l1 l4 shape oval frame profile min 23 mm frame max 26 mm length 695 cm length inches 27 technologies head graphenext head asp adaptive string pattern season 2016 special feat