This CUSTOM TUNED DNM Spring Shock is exactly what your razor needs to become the Ultimate version of itself you always dreamed it could be. We STRONGLY recommend this shock to pair with our ETM Front Fork Kit for a balanced ride feel and height.  With real damping via hydraulic design you are sure to feel like your riding a totally different bike! Not only is the rebound adjustable on this little guy, the dampening is also adjustable! OUR EXCLUSIVE VERSION COMES WITH A 450LBS SPRING STANDARD WHICH IS BETTER SUITED FOR THE RAZOR PLATFORM (250 lbs. spring is optional for kids) DONT GET STUCK WITH A 550LBS SPRING FROM ELSEWHERE WHICH IS TOO STIFF! Compatibility RAZOR SX500 ONLY. NOT INTENDED FOR MX500, MX650 OR RSF! Specifications DNM RCP-2S 220MM (eye to eye) 450 lbs (250lbs optional)