This dual rate spring kit is specific to our 39" Pro RMK AXYS A-Arm kit and built for your stock shocks. The stock springs will be too soft for most riders and too soft for aggressive riders. By using a dual rate kit we still get a nice plush ride but allow you to hit stuff fast and jump without bottoming. The kit includes two main springs, two spring collar adaptors for the walker evans shocks, two spring dividers with build in crossover, and two tender springs. If your still looking for more upgrade those stock shocks to a set of our Exit shocks and the spring kit will still work. Saving money when you purchase the better shock absorber. Fits ARSFX 39" A-Arm Kit.