The Dorman M630641 Brake Master Cylinder is designed for 2009-2011 Ford Focus models, replacing OEM part numbers 9S4Z2140B and AS4Z2140A. Made of aluminum with a bore diameter of 15/16 inches, this master cylinder features a rust preventative finish and is manufactured in China. It comes with 2 ports and is not a performance part, suitable for standard brake system maintenance. The product is known to contain materials that may pose cancer and reproductive harm, as indicated by the California Prop 65 Warning.