Compression Spring made of various material with different finish; Made in ISO/TS16949:2002 and ISO14001 ... carbon steel, spring steel, alloy spring steel, refractory steel, high temperature resisting alloy, corrosion-resistant alloy, brass, and bronze ... -friendly products: RoHS compliantGood quality control: serious QC procedure to assure the good quality in mass productionExperienced in handling ...