http://tinyurl.com/lsmyv8yE3 Spark Plugs E3.18 Small Engine and Lawn & Garden Spark Plug , Pack of 1Product Review Click on the link for more reviewsNear elimination of performance inhibiting carbon deposits, dramatically longer plug life and limited warranty for the lifetime of the first engine the plug is installed inDiamondFire electrode technology that creates a superior spark and resulting flame front extending further into the cylinder, producing more localized pressureSignificant potential power increase: > 6% to 12% (depending on engine class)Significant potential fuel efficiency improvement: > 4% to 13% (depending on engine class)Drastic potential emissions reduction when used in 2 and 4-stroke engines (after 50 hours): 58% CO emissions reduction, 42% hydrocarbon reduction