Bosch Double Iridium Spark Plugs are engineered to deliver both high performance and long life, representing the best of OE spark plug technology. The ultra-fine wire design and laser welded tapered ground electrode deliver optimum performance, while the iridium center electrode firing pin and iridium-platinum alloy inlay in the ground electrode help it to go the distance. Unlock the performance in your engine with Bosch Double Iridium Spark Plugs.