This dual rate spring kit was tested and developed during the whole 2011 season and works wonders for the front end of the Pro Assault. The stock springs are too soft for most larger 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.