Proforce 31307 - TOP QUALITY DISC ROTOR (Front) All rotors are manufactured to OE specifications and all rotors go through rigorous testing to ensure the correct chemical composition, hardness, and thickness. Our materials are based on stringent SAE specifications. OE thickness and increased content of rotor vanes ensure optimal heat dissipation, resulting in better braking performance and longer life. Superior surface finishing helps to reduce premature rusting. ISO/TS 16949 certified. Our precision machining ensures optimal braking performance and anti-pedal pulsation even in the most severe conditions. Each unit is tested for 100% performance First class quality. Reliable design and production.