Benefits of using coil spring buffer:- AMT SPRING BUFFER With this Car Spring Bumper, safety will enhaced when driving at sudden curves, unpaved and bumpy road surfaces, etc. It obviously reduce the shock of the chassis, enhance the comfortableness while driving, diminish the noise remarkably, enables to drive happier. This AMT Spring Bumper is also effectively solve the spring's exhaustion problem. Promote and heighten the shock-absorption effects. Protect the shock absorber and the suspension system, save the maintenance cost, lengthen life cycle of the braking component. -reduces noise and vibration from suspension component (ngek ngek sound) Vehicle body will heighten by 3 ~ 5cm. Please confirm your car's shock absorber spring gaps is same with the size of Product Description, if you have questions, please contact the seller, thanks! item description Product Type: automotive-specific buffer Material: transparent urethane material Buffer Specification: TYPE A Applicable spring gap: 49mm Applicable spring diameter: 173mm Applicable Spring thickness: 13mm Buffer Specification: TYPE B Applicable spring gap: 39mm Applicable spring diameter: 160mm Applicable Spring thickness: 13mm Buffer Specification: TYPE C Applicable spring gap: 28mm Applicable spring diameter: 131mm Applicable Spring thickness: 10mm Buffer Specification: TYPE D Applicable spring gap: 20mm Applicable spring diameter: 113mm Applicable Spring thickness: 10mm Buffer Specification: TYPE E Applicable spring gap: 17mm Applicable spring diameter: 112mm Applicable Spring thickness: 9mm