Our High Carbon Alloy brake disc Advantage as below:1.carbon equivalent 4.0%-4.3%2. High Carbon Disc for Performance Use3. Cast and Machined for Reduced Vibration and Noise4. The High Carbon Content Improves Thermal Stability5. Rotor hardness soft and avoid the noise but have long life6. New Vee Slot Design removes Dirt & Gases7. Dynamically Balanced to Reduce Vibration8. Reduce the risk of cracking and warpingIf have any requirement,welcome any customer contact with us!