 This is a set of replacement XRAY 4.0 Rate Silver Front Coil Springs, and are intended for use with the XRAY XII and X10 Pan Cars. These ultimate-match front coil shock springs for pan car front suspension offer an additional range of choices to fine-tune your car and are color-coded for quick & easy identification.
Developed through extensive testing and racing experience. Stiffness is controlled by the thickness of the wire and also by the number of coils; softer springs have a lower "C" value, while stiffer springs have a higher "C" value.
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