The KYB Excel-G shock absorbers are twin tube gas shock absorbers, struts and cartridges. Assembled at the factory and then inspected to be sure they are exact you can be sure you are recieving a product that will consistently deliever a better than new handling and ride comfort feel.The Excel-G shock absorber has been specially designed to compensate for the accumlated wear and tear on other parts of the suspension system, the Excel-G is able to do this by using a patented valving with nitrogen gas system that is able to reduce aeration and foaming as this is usually what causes shocks to fail even after a few minutes of operation. These are then able to provide a better ride and better steering response.Sold individually.