NGK Spark Plugs Spark Plug Dcpr7E. That's because we use higher quality materials and go through a strict manufacturing process to insure the highest possible quality control. The use of NGK's "Dual Core Plus" technology in the plug's core provides a longer life. The use of separate copper grounded shields for grounding provides even better heat transfer and electrical insulation. The use of a patented three gasket sealing process eliminates the possibility of combustion gas leakage and a longer insulator nose prevents fouling and misfiring. Also NGK's "Dual Core Plus" plugs have a longer center wire that provides more arcing and sparking action than conventional plugs. This design makes 'em tough Features of NGK Spark Plugs 3932 Spark Plug Dcpr7E Designed to operate over a much wider heat range than ordinary plugs Resists carbon buildup and pre-ignition High alumina ceramics for better heat transfer and electrical insulation Solid copper core and nickel tipped electrode provide a longer plus life Patented triple gasket sealing process eliminates the possibility of combustion gas leakage Package Contents: NGK Spark Plugs 3932 Spark Plug Dcpr7E NGK Spark Plugs 3932: Spark Plug Dcpr7E