Thickness: 0.15 ~ 20mm This is a type of spring in which the wire or steel band is wound into a Thickness: 0.15 ~ 20mm This is a type of spring in which the wire or steel band is wound into a plane helical. One end of the spring is fixed, while the other end, once being subjected to a given torsion, will generate an elastic bend deformation by which the spring will twist within its plane. The more the turns, the larger the deformation angle, and the higher the stored energy. This type of product is usually used as a compacting spring or energy-storage spring in instruments, watches and clocks. Inner packing: plastic or PE bags Outer packing: corrugated cartons or wooden boxes