The Bosch Super Plus Spark Plug has a premium copper core plus an yttrium-enhanced center electrode to provide an extended performance life over conventional copper- core spark plugs. Product Features:Heavy-duty yttrium-enhanced copper core center electrode provides superior reliability and durability for an extended performance lifeTapered, V-profile nickel chromium ground electrodes improve starting in cold weather and promote increased fuel ignitabilityNickel-plated rolled threads provide maximum interference suppression
