4X longer service life compared to standard copper plugs Bosch OE Finewire Iridium is engineered to deliver both High performance and long life. The Bosch Iridium Plug provides original equipment design, materials and processes represent the best of OE technology. The ultra fine wire design and laser welded tapered ground electrode deliver optimum performance, while the iridium center electrode and platinum ground electrode help it to go the distance. Center Electrode Core Material: Nickel-Yttrium and Copper and Iridium - Center Electrode Tip Material: Iridium - Ground Electrode Tip Material: Nickel-Yttrium and Iridium Product Features:OE design for optimum fit and functionCenter electrode is an ultra fine wire design.Provides broader heat range to resist pre-ignition and foulingDelivers exceptional ignitability and performanceTapered shape ground electrodeLaser welded iridium-platinum alloy inlayNickel-plated shell with rolled threadsAnti-seize and corrosion protection
