The product is a set of four Denso W29ES-ZU spark plugs designed for motorcycles from various manufacturers like Honda, Yamaha, Suzuki, and Kawasaki. Made of steel and with a silver color, these spark plugs are vintage parts with a universal fitment for years ranging from 1975 to 2005. They are performance parts that are compatible with 2-stroke and 4-stroke engines, providing reliable ignition for improved motorcycle performance. With a manufacturer warranty included, these spark plugs are a high-quality option for motorcycle maintenance.