ACDelco Professional DuraStop Reman Loaded Disc Brake Calipers use both aluminum and iron castings, making them the ideal high quality aftermarket replacement for your GM and non-GM vehicle. These loaded calipers contain Ethylene Propylene (EPDM) rubber components to provide superior resistance to heat, corrosion, and leakage. ACDelco Professional DuraStop Reman Loaded Disc Brake Calipers are developed with Professional DuraStop brake pads already attached ? no assembly is required. Also included are bleeder screws, copper sealing washers, hardware, and mounting brackets for easy installation. Brakes are one area in which vehicle owners simply cannot compromise. With ACDelco Brakes, you can get the peace of mind that comes with parts that are expertly engineered, manufactured to stringent tolerances, thoroughly tested and backed by the ACDelco name. Choose from our GM Original Equipment, Professional DuraStop, Advantage, and Specialty Series to meet your performance needs and budget.