This kit gives a substantial improvement in ride quality while improving handling as well at G-out resistance. We've found the perfect combination of spring length to rate ratio and are very happy with our results. This kit is for all four corners of the machine. It provides a short spring, a long spring and a delrin spacer for each shock. The secret is in our short springs. We've found a perfect rate which allows us to custom tailor our long springs, (which determines the final rate of the suspension) to each individuals needs.