Since 1936 NGK has been dedicated to performance and quality. NGK is one of the worlds largest and most specialized manufacturers of ignition related car parts. Primarily known as the largest OEM supplier of spark plugs to the automotive industry. NGK's expertise has also transitioned into other parts such as electrical switches, solenoids, O2 sensors, ignition coils, ignition wires and even NTK cutting tools. NGK is without a doubt the world's most trusted spark plug manufacturer.