A spring is an elastic object that stores mechanical energy. Springs are typically made of spring steel. There are many spring designs. In everyday use, the term often refers to coil springs. When a conventional spring, without stiffness variability features, is compressed or stretched from its resting position, it exerts an opposing force approximately proportional to its change in length. Truing is the process of positioning an object in its optimal balance and operating position or changing the shape of the object to return it to balance after it becomes worn. Specifications. Height 0.55 in.. Width 3.95 in.. Length 2.95 in.