Rear progressive springs are somewhat progressive, but under more compression change characteristics to be more linear. This provides a fantastic feeling & feedback of this car in every different track conditions. Marked with TWO dots for simple identification. Set of 2. Available as moobs, the springs are separately measured, managed, examined and matched to provide identical damping faculties. Through the selection procedure, each spring is compressed in several fine increments together with values recorded, after which each spring is matched with another springtime of identical faculties. XRAY goes the extra mile to make certain perfect springtime fits, offering your car the predictability and persistence you need to help you lead the pack.