ACDelco Advantage Disc Brake Rotors provide reliable vehicle braking power. They feature a thickness variation that is less than 0.0005 to minimize pedal pulsation, noise and help to extend brake pad life. With a 12 month/unlimited mile warranty, ACDelco Advantage Disc Brake Rotors deliver quality performance and peace of mind. Also, no machining is required. ACDelco Advantage Disc Brake Rotors are ready to be installed right out of the box.