Bosch OE Fine Wire Iridum Spark Plugs feature original equipment design, materials and processes that represent advanced OE technology that delivers both high performance and 4X longer life than standard copper spark plugs The fine wire design of the center electrode improves ignitability and performance while the iridium center electrode and iridium-platinum tipped ground electrode provides an extended service life Ribbed insulator design seals tightly against the wire boot preventing misfires due to flash-over Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize for installation Bosch Iridium spark plugs are pre-gapped at the factory and ready to install right out of the box - gap adjustment prior to installation not required Compatible with select vehicles (Note: engine affects fitment - verify specific fitment details with amazon confirmed fit fit checker above): CHRYSLER: 2008-09 Aspen; DODGE: 2008-10 Dakota, 2008-09 Durango, 2008-10 Ram 1500, 2010 Ram 2500 Compatible with (continued): JEEP: 2008-10 Commander, 2008-09 Grand Cherokee; RAM: 2011-13 Ram 1500, 2011 Dakota