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Ultra fine wire center electrode and tapered ground electrode increase ignitability and reduce spark quenching. Laser welded iridium tipped center electrode and iridium-platinum alloy tipped ground electrode promote durability and long life. Improved insulator design increases dielectric strength and provides greater resistance to irregular burns and mega-knocking. Copper core helps prevent pre-ignition and fouling. Nickel-plated shell and rolled threads provide anti-seize and corrosion protection. Ribbed insulator prevents flashover.