ACDelco Professional Double Platinum Spark Plugs are premium aftermarket plugs, and are a high quality replacement for many vehicles on the road today. With a copper core and double platinum pads on the center electrode, these plugs are designed to deliver long-lasting performance. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. Product Features:One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long lifeDouble platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition systemPure copper core results in cooler electrode temperature for maximized durability and fouling resistanceNickel-chrome alloy sheathing helps prevent corrosion on center electrodeAvailable for use in Marine applicationsSome ACDelco Gold parts may have formerly appeared as ACDelco ProfessionalPremium aftermarket replacement partManufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models