The product is a set of 4 Champion Spark Plug RCJ7Y resistors with the manufacturer part number 859. These spark plugs are designed to improve ignition performance and are suitable for use in various vehicles. The California Prop 65 Warning indicates that they contain nickel, which is a known allergen and toxic substance. Champion Spark Plugs are a reputable brand known for producing high-quality ignition components, making this product a reliable choice for car and truck owners looking to enhance their sparking systems..