Iridium Xtreme Start Spark Plugs are engineered with an iridium-enhanced fine wire electrode to last twice as long and provide better fuel efficiency than copper plugs. With coverage for more than 95% of popular lawn and garden equipment, you’ll get quicker, more consistent starts with no need for plug changes. From lawn mowers to chain saws, Autolite Iridium Xtreme Start Spark Plugs provide quicker consistent starts versus the average plug and an anti-foul design. The 0.6-millimeter iridium-enhanced fine-wire design offers exceptional fouling resistance, providing reliable starting in any season or weather condition. Iridium Xtreme Start plugs have up to 26 percent quicker engine starts than leading standard plugs, for less battery and starter wear as well as less pull-cord effort required. They also have up to 21 percent less HC emissions than a standard plug, for better fuel efficiency and horsepower. These plugs are specifically designed for each application to meet or exceed OE quality and performance.