ACDelco Specialty Performance (Severe Duty) Disc Brake Rotors provide reliable vehicle braking power. They feature a thickness variation that helps to minimize pedal pulsation and noise and helps to extend brake pad life. These brake rotors meet the SAE standard for structural integrity with OE-matched material delivering guaranteed performance. Black and gray fusion coating provides corrosion protection. These rotors are uniquely designed for off-road vehicles SUVs trucks and fleet trucks. ACDelco Specialty Performance (Severe Duty) Disc Brake Rotors are ready to be installed right out of the box - no machining required.