Zimmermann Disc Brake Rotor - 600324152: Zimmermann Disc Brake Rotors are designed to provide superior stopping power and improved braking performance in all driving conditions. They feature an advanced design that allows for better heat dissipation, improved braking performance and longer rotor life. The rotors are made from high-grade cast iron that is hardened for additional strength and durability. They are also designed to reduce brake noise and vibration, making them ideal for both street and track use.