Stainless Steel has excellent resistance to atmospheric corrosion, and tensile strength..Because R.O.Foil providees stainless foil strips that are accurate to the micron level n thickness and uniform in properties thanks to our advanced rolling and tension annealing technologies, they provide the best choice for leaf springs requirements such as metal domes in electronic button switches and relays. Additionally, the quality in strength provides excellent durability for components which require maintanance of spring quality.R.O.Foil is the choice for many high-tech component manufactures at home and abroad for high quality stainless steel foil strips.