This sale is for a set of 10 Motorcraft AGSF52C spark plugs. These vintage new old stock plugs are an excellent replacement for SP-442 vintage plugs. The plugs have a standard configuration, are made of copper material, and have a voltage of 12V. They are compatible with a range of vehicles, including those that require STK 42, AC3, R46LTS, TR5, SR5, RS14YC, and R44LTS interchange part numbers. The plugs were manufactured in the United States and are suitable for use with gasoline. Please refer to the provided OE/OEM part numbers for compatibility with your vehicle.