The 11.75" diameter slotted pillar vane rotor is engineered to provide superior strength, reduce rotor weight, and run cooler. At the heart of the pillar vane rotor, each pillar is diamond shaped and precisely positioned to optimize pad surface support thereby eliminating rotor cupping. Each rotor has been manufactured using premium grade alloys for superb thermal shock stability, double disked ground to ensure precise flatness, slotted to eliminate brake gassing between the rotor and pad surface to eliminate pad tapper and improve surface contact between the rotor and pad, and is rotationally balanced to reduce vibration and improve traction. For the best stopping power, use AFCO brake pads with this rotor. You will not believe what you have been missing out on.