This .600" lift spring kit has been designed by Patriot to provide the highest quality and performance without breaking the bank. This single spring configuration has 115 lbs on the seat and 285 lbs open. They are great for forced induction applications. Complete kits come with 16 springs, 16 titanium retainers, 32 locks, and 16 viton seals. 1 kit required for 1 pair of heads.