Just like distributor caps, distributors rotors must have high tracking resistance and be made of the highest quality materials. Bosch supplied the world's first high-voltage ignition system in 1902 and has long been known for premium quality European ignition parts. Bosch also offers an equally superior line of ignition products for Asian cars and light trucks. Long recognized as an industry leader in ignition and fuel systems, Bosch's quality, innovation, and experience are the foundation of the entire line of engine management components.