Helix Zinc Plated Exhaust Springs Features: Zinc-plated, tempered steel exhaust springs Sold in 2 pack (1 pair) or a 10 pack (5 pairs) For correct fit, an exhaust spring should not be extended more than 20 of its free length Exhaust springs should be measured when they are off the vehicle Wear eye protection when removing The length measurement should be taken from inside hook to opposite end inside of hook