Iridium Ix. The improved throttle response, stronger anti-fouling and high-ignitability makes Iridium IX ® suited to the performance enthusiast. Iridium’s extremely high melting point is perfectly suited to today’s high-temperature engines, providing outstanding acceleration, fuel efficiency and long service life. Fine iridium tip guarantees high long service life and a consistently stable spark Trivalent metal plating for stronger anti-corrosion and anti-seizing properties Outstanding acceleration, high fuel efficiency and long service life *By request/order.