Perfect for direct OEM replacement applications, Laser Iridium spark plugs for the Cooper S provide superior ignitability and long service life. NGK Laser Iridium spark plugs feature the smallest tip diameter available Iridium surface to ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. Designed as a OEM compliant replacement plug, Laser Iridium spark plugs are designed with a laser welded iridium tip, and Trivalent metal plating for faster starts and quicker acceleration.