This is a pack of two Team Associated 12mm Rear Shock Springs. These springs are designed for use with 12mm shocks and are 72mm long, making them ideal for use on the rear shocks of short course and stadium trucks. These springs are rated at 2.20lbs with a green color indication. 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