Acdelco 41-110 OEM Gm 12621258 Professional Iridium Spark Plug - Set of 8 Latest evolution in high-performance plug electrode material and New-vehicle applications using iridium plugs continues to increase Improved cold-starting and acceleration characteristics. Reduced ignition system voltage demands saves wear and tear Spark gap remains virtually unchanged during the life of the plug for increased fuel efficiency and 12-month/12,000-Mile Limited Warranty ACDelco is an Original Equipment (OE) supplier and has the experience engineering and manufacturing components that achieve the highest quality standards required by vehicle manufacturers Iridium tip for maximum resistance to spark erosion and corrosive combustion chamber environment