... a variety of 0.2mm-65mm in diameter, spring, metal springsquare spring, disc spring, spring grinding, winding etc.to the instrumentation, automotive, ... About products: our serpentine spring used in sofa, chair, seat and etc.Can make in rolls and cut in pcs. ... mattress, sofa and other usages.We are the expert on spring industry.Place of Origin: DanDong,LiaoNing, ChinaMaterial: stainless steelPayment ...