This is a replacement Tekno RC 65mm Front Shock Spring Set, and is intended for use with the Tekno RC SCT410 4wd Short Course Truck. These springs are 9.5 turns of 1.5mm wire, and are the stock front springs included in the kit. Effects of Shock Spring Changes Shock Spring Characteristic Softer Increased Chassis Roll Increased Traction Better in Bumpy Conditions More Likely to Bottom Out Stiffer Decreased Chassis Roll Decreased Traction Increased Responsiveness