1.made of high quality wire 2.guaranteed services& quality 3.more than twenty years experience in spring made 4.fast delivery spring , hardware spring,tension coil springs,spiral spring,Coil Spring Products,1.Applications: Automotive, medical device, electronics, toy etc.2.Surface treatment:Zinc,Nickel,silver,golden,tin,powder coating.3.confirmed to ISO 9001-2000 standard , Coil Spring Products