Victor Thruster K 66 Badminton Racket (TK-66) (Unstrung) (Free String)TECHNOLOGY Power Box The box shaped design effectively increases the stability and anti torque, can stand higher string tension. Nano Tec The Nano Tec Technology works by evenly distributing nano sized particles in the vacant space between carbon fibre bundles, thereby increasing the overall stiffness of the carbon composite fibres greatly while reducing frame distortion. Seven Six 76 The Single Pass grommet hole construction causes lesser friction