... ISO9001,ROHS,SGS 3>Material: steel 4>Customizable Comfortable saddle spring,saddle torsion springs1>9 years of experience in producing springs2> ... stainless steel wire(corrosion resistant and heat resistant steel wire), bronze, copper, phosphorus copper, beryllium copper. Alloy steel has 60Si2MNA, ... , which ensured the spring quality stable and precise. / comfortable saddle deformed torsion spring