This product is a set of 10 vintage Autolite ARF-42 resistor spark plugs, made in the USA by Ford Motorcraft. These standard spark plugs have a 12V voltage and are designed for gasoline fuel type. With the OE/OEM part number C9PZ12405B, these plugs are authentic and compatible with classic Ford vehicles, making them a valuable addition to any car or truck needing ignition system components.