Ultimate-match front coil shock springs for pan car front suspension system with 4mm master pin axle offer an additional range of choices to fine-tune your vehicle. Powder color-coded for fast & effortless identification. Silver color. Pair of 2. Developed through extensive testing and racing experience. Stiffness is controlled by the depth of this cable and in addition by the number of coils; softer springs have actually a lesser "C" value, while stiffer springs have actually a greater "C" value.