ACDelco Gold (Professional) Enhanced Performance Police Disc Brake Rotors are a high quality alternative to Original Equipment (OE) parts. They feature a thickness variation that helps to minimize pedal pulsation, noise, and help to extend brake pad life. These rotors meet the SAE standard for structural integrity with OE matched material, delivering guaranteed performance. ACDelco Gold (Fleet/Police) Disc Brake Rotors are ready to be installed right out of the box - no machining required. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional. Has a few marks on the metal but brand new and ready for installation Damped iron metallurgy reduces noise and dissipates heat