The Metron 4D Flat combines the superb ergonomics and aerodynamics of the Metron 4D, with a lower hand position and an innovative Modular Aero System (MAS) direct-mount clip-on system for additional versatility. Reinforced carbon fiber construction gives a great strength-to-weight ratio. The 4D features internal cable routing, with guides that accommodate wiring for electronic shifting. Open box product comes with original box, spacers, screws and original adjusting parts.