Corrugated ribs help prevent "flashover" of spark which can lead to harmful misfires and rob you of perfomance
Highly pure alumina silicate insulator ensures dieletric strength and incredible physical strength. Sophisticated ceramic properties unsure proper heat transfer
Solid copper core other manufacturers claim to use a solid copper core, but NGK uses a large amount of copper to ensure greater spark and heat transfer
Longer insulator nose this superior design sometimes called a "power tip" helps prevent loading or fouling even after prolonged periods of idling or at slow speeds
Double dipped zinc chromate shell which ensures maximum rust resistance