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Power springs, also known as clock, motor or flat coil springs, consist of strip wound on an arbor and confined in a case or ring. Power springs store and release rotational energy in the form of torque, either through the central arbor or the case in which it is restrained. Power springs and prestressed power springs are similar in appearance. However, prestressed power springs have greater energy storage capacity due to residual stress distribution manufactured into the strip prior to placing the spring in its case. When a prestressed power spring is removed from its case, it assumes an S shape, while power springs assume a spiral shape .