GM Genuine Parts Coil Springs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Coil Springs (also called helical springs) are a type of torsion spring which can store energy and release it later when needed. They also help absorb shock and maintain the force between two contacting surfaces. These springs help support the weight of your car, maintaining the proper trim or ride height of the vehicle, and helps to stabilize even in rough driving conditions. They have the ability to extend when you hit dips on the road and compress when you encounter bumps or cut into hard corners. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE). WARNING: Cancer and Reproductive Harm