Autolite Copper Small Engine Spark Plugs are engineered for long life and cover lawn mowers motorcycles and other recreational vehicles. Small engines work under dirty demanding conditions. Replace your spark plugs often in your mower tractor chainsaw blower and more to keep them running better and working harder. Autolite is the leading supplier of spark plugs; offering the best alternative to OE spark plugs. Because you take working outdoors seriously Autolite small engine spark plugs feature a nickel alloy center and side electrode nickel-plated rolled threads and a steel shell. If you take care of your engine once a year it will take care of you all season long.