NGK Iridium IX spark plugs deliver superior ignition performance with a fine-wire iridium center electrode that fires at lower voltages while maintaining exceptional durability. The DPR9EIX-9 features a tapered cut ground electrode for improved spark efficiency and faster flame kernel development. Engineered for extended service intervals, these plugs provide reliable cold-start capability and reduced fouling across a wide range of engine conditions. Ideal for high-performance and standard applications requiring premium combustion characteristics.