Coiled from high-quality spring steel and processed by quenching and tempering technology, it maintains lasting and stable elasticity, resisting fatigue attenuation, deformation and fracture. It delivers good toughness and uniform bearing force with standard rebound strength, adapting to positioning and resetting function of transmission operating mechanism. Resistant to high and low temperature and rust, it keeps stable performance under frequent expansion and contraction for a long time, suitable for heavy-load complex working conditions. With original factory standard size and high installation matching degree, it features long service life and is not easy to fail or stagnate.