This is the optional Soft Rear Shock Spring for the DuraTrax DXR500 Motorcycle. FEATURES: Steel construction, white in color Replaces stock Rear Shock Spring key #50 INCLUDES: Soft Rear Shock Spring REQUIRES: Installing over rear shock following instructions in manual COMMENTS: Also available in the following dampening rates; Hard, DTXC4816 Stock, DTXC4814 jxs 06/02/11 ir/jxs