Service Description : They are made of an elastic materi... They are made of an elastic material formed into the shape of a helix which returns to its natural length when unloaded. A coil spring may also be used as a torsion spring- in this case the spring as a whole is subjected to torsion about its helical axis. The material of the spring is thereby subjected to a bending moment, either reducing or increasing the helical radius. In this mode, it is the Young’s Modulus of the material that determines the spring characteristics. Compression Springs, LeeP Plastic Springs, REDUXTM Wave Springs, HEFTYTM Die Springs, Extension Springs,Torsion Springs, Belleville Washers, Specialty Parts, Custom Springs.