Brembo 09.9477.23 Front Disc Brake Rotor Enhanced Performance Venting - The use of Brembo Pillar Venting Technology or directional venting allows improved cooling and greater resistance to cracking; High Carbon cast iron minimizes noise and vibration and provides maximum performance Aluminum Hub - Considerable weight reduction of the disc, with benefits in terms of performance and emission reduction Braking Surface-Hub Connection - Allows braking surface of the floating discs to expand without causing permanent deformation Alloy cast iron braking surface - The use of special alloy cast iron with a high carbon content guarantees the best performance, even in the most extreme braking conditions Grooves/Drilling - The use of grooves and holes on the braking surface creates the following advantages: Continuous revitalization of the friction material, Improved cooling, performance in wet conditions and resistance to fading