Package included : 2 pieces Car Shock Absorber Spring Bumper Features 1. Improve the performance of shock absorber, Effectively solve the problem of springs weakness when heavy load. 2. Improve driving comfort, Steering more stable. 3. Reduce pumping of absorber when passing through road hump. 4. Reduce noise and vibration during traveling 5. Protect shock absorber and suspension system to avoid oil leak. 6. Improve braking efficiency. 7. Size for all types of car including lowered spring and adjustable. 8. Easy to install, universal fit for most cars, trucks and SUVs. Install 1.Ready the tools and product. 2.Jacked the car. 3.Until the spring the extended 4.spray some water to the car spring 5.install on the car 6.finish. Measure the size 1. Car spring spacing 2.Colloidal height 3.Car Spring spacing PSthe spring spacing must be measured under the condition that the boday of the car is placed flat and there is not sitting person or heavy weight in the car A Size: Spring Spcing:47mm(1.89Inch),Collordal height:81mm(3.19Inch) B Size: Spring Spcing:39mm(1.54Inch),Collordal height:72mm(2.83Inch) C Size: Spring Spcing:27mm(1.06Inch),Collordal height:52mm(2.05Inch) D Size: Spring Spcing:21mm(0.83Inch),Collordal height:44mm(1.73Inch) E Size: Spring Spcing:16mm(0.63Inch),Collordal height:39mm(1.54Inch) F size: Spring Spcing:14mm(0.55Inch),Collordal height:38mm(1.50Inch) A Plus size: Spring Spcing:60mm(2.36Inch),Collordal height:93mm(3.66Inch) B Plus size: Spring Spcing:34mm(1.34Inch),Collordal height:63mm(2.48Inch) C Plus size: Spring Spcing:32mm(1.26Inch),Collordal height:60mm(2.36Inch)