NGK Fine Wire Racing Plugs are designed to give you a stronger spark from your existing ignition system. Fine wire platinum center electrode requires less voltage to ionize (jump) the plug gap. This allows a stronger spark which will better ignite the air fuel mixture leading to more power. The platinum center and ground electrodes provide increased durability. Fine wire platinum ground electrode helps to reduce quenching. Hand made in Japan and constructed to withstand the most extreme racing environments.