Xray Front and Rear Progressive Spring Sets

These new matched front and rear springs from Xray are progressive in that they become harder during compression. Xray claim that these springs makes the car steer better at the beginning of the corner, but resist rolling in the middle of the corner because the spring becomes harder, and are recommended for medium-high traction tracks.
Available as a pair, the springs are individually measured, controlled, inspected and matched to provide identical damping characteristics. During the selection process, each spring is compressed in several fine increments and the values are recorded. Each spring is then matched with another spring of identical characteristics.

#358174 Xray Front Spring Set Progressive C=0.7-0.8 (2)
#358274 Xray Rear Spring Set Progressive C=0.5-0.6 (2)

Source: Xray