This is an optional XRAY Rear Spring Set, and is intended for use with the XRAY XB4 1/10 scale 4WD buggy. These springs are harder than the 0.40 springs included with the XB4.
These XRAY Premium shock springs are designed specifically for big bore shocks. They have been manually measured, selected and matched into pairs to guarantee equal length and damping characteristics. The springs then receive a laser engraving for easy identification.