Adult tennis racket head size oversize racket head size 684 cm head size inches 106 sq in stringing 16 x 20 level beginner type of racket all round racket balance 335 mm recommended height from 155 cm weight strung 295 g racket balance even grip size l2 l4 shape oval frame profile min 23 mm frame max 23 mm length 686 cm length inches 27 technology wilson arc technology season 2015 player roger federer series wilson recre