The POWER BOX design offers enhanced stability and anti-torque, enabling it to take higher string tension. NANO TEC technology distributes nano-particles between carbon fiber bundles, increasing stiffness and decreasing distortion. SEVEN SIX 76 single-pass grommet holes reduce friction, retaining tension and prolonging strings. FRS multi-layered carbon fiber amplifies elasticity and supplies steady control at high tension. The TK-70 is a lightweight racket.