Wilson K Fantom Badminton Rackets are lightweight rackets for additional control with an amazing blend of flexibility and balance. Wilson K Fantom Badminton Rackets are designed for singles players looking for more bite on court. K Factor technology combines Nano technology and unique frame engineering innovations to result in the ultimate racket for all player types. Kontour Joint - New frame and shaft engineering technology enhances stiffness at the joint area for improved torsional stability. New top Kap construction lowers the shaft kick point for a more flexible shaft resulting in increased power and controlled performance. Quad Shape. Ideal for Singles Players.