Brand Bosch Material ABS, Aluminium Exterior finish Zinc Manufacturer Bosch UPC 031808157658 077212078004 Global Trade Identification Number 00031808157658, 00077212078004 Precision balanced to insure smooth operation with no pedal pulsation OEM style vane configuration provides more efficient heat dissipation, reduces vibration that can cause noise, and extends rotor life G3000 heat-flowed castings provide consistent wear, long life, and quiet operation Bi-metal aluminum and zinc clean-look coating/Alutherm 80 extends the life of the rotor and provides a clean look for today's open wheels OEM style ABS tone ring (on required applications) provides trouble free operation of Antilock Brake and Traction Control systems Outer dimension: 335.9mm