NGK DPR8EIX-9 Iridium IX Spark Plugs are the key to ultimate performance. Specifically designed to suit the needs of the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling properties. Long service interval life and better ignitability than conventional spark plugs. Designed to meet or exceed OE Spark Plug standards. Fine iridium tip ensures high durability and a consistently stable spark. Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Outstanding acceleration, high fuel efficiency and durability. Ultimate design, technology and performance. Specifications - Depth (cm): 2 Length (cm): 8 Width (cm): 2 Part Number: DPR8EIX-9 Type: Spark Plugs - Iridium.