ACDelco Gold (Professional) Drum Brake Wheel Cylinders are a high quality alternative to Original Equipment (OE) parts. They use both aluminum and iron castings making them a high quality replacement for many vehicles on the road today. These wheel cylinders contain both Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber components to provide superior resistance to heat, corrosion, and leakage. Formulated with a smooth bore finish, these cylinders have a quality seal to help increase the life of rubber components. ACDelco Gold (Professional) Drum Brake Wheel Cylinders are ready to bench bleed and install right out of the box – no assembly 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. \\u0026#9888 WARNING: Cancer and Reproductive Harm – https://www.P65Warnings.ca.gov