All QuietCast rotors are factory mill precision balanced, which disperses the weight evenly, and allows for smooth, safe stops with no pedal pulsation Performance ensured by OEM style vane configuration that provides more efficient heat dissipation, reduced vibration for quieter operation, and extended rotor life Aluminum/Zinc coating protection prevents rust and corrosion, extending the life of the rotor while providing 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 Every Bosch QuietCast rotor features an engraved discard thickness, that lets you know when the rotor has reached its useful life, and an “on-the-part” Bosch brand name, so you can be confident you are receiving an authentic Bosch product FRONT: 296mm; Compatible with select vehicles (Note: vehicle trim level/engine may affect fitment - verify specific vehicle fitment details with fit checker above): CHEVROLET: 2005-08 Cobalt, 2008-10 HHR, 2004-12 Malibu; PONTIAC: 2007-10 G5 Compatible with (continued): PONTIAC: 2005-10 G6, 2006 Pursuit; SATURN: 2007-09 Aura, 2004-07 Ion