Xray release their new line of Ultimate Racing Springs for front and rear shock absorbers. All feature the same thickness wire with the stiffness being controlled by the number of coils. Softer springs with lower “C“ value have more coils whereas stiffer springs with higher “C“ value have fewer coils. They come black coated and the top of each spring is laser engraved with spring size for quick and easy identification. Available as a pair of C7.0 to C10.0 front and C5.0 and C5.6 rear springs, each one is individually measured, controlled, inspected and matched to provide identical damping characteristics. Also available is a progressive C9.0 spring marked as 7-9 that feature a progressive rating from 7.0 to 9.0 while being compressed, making the car steer better at the beginning of the corner, and resist rolling in the middle of the corner because the spring becomes harder. Recommended for medium-high traction tracks.