Braking Batfly Cross Brake Rotor BY4501Designed specifically for high end Offroad MX and Supercross racing The Batfly rotors design improves heat dissipation, resulting in lower operating temperatures throughout the entire system. The result is a better progression in brake feel and better overall performance than any other rotor system available in the market today Edges across the outer profile continuously clean the pads surface, renewing it and providing the best pad rotor contact