The product is an original equipment General Motors Iridium Spark Plug designed for specific models of Buick, Chevrolet, Pontiac, and Saturn vehicles from the years 2006 to 2011. It is a direct replacement part with the manufacturer part number 12681662 and interchange part number 12591131. The spark plug is made of iridium material and is suitable for gasoline engines. It comes with a California Prop 65 Warning indicating that it may cause cancer and reproductive harm. The spark plug is a genuine OE/OEM part made in the United States by General Motors.