DENSOs First Time Fit relays are no different from the OE relays DENSO has manufactured for over 60 years built to be quiet, efficient, and reliable. Designed and manufactured to outlast the closest competitor by a minimum of ten times more life cycles, DENSOs First Time Fit Relays will most likely out last your car. Holding approximately 30,000 active patents worldwide - approximately 7,300 in the United States - DENSO is going all out to design groundbreaking systems and components tuned especially to consumers' specifications - whether they are drivers, passengers, pedestrians or society as a whole.