302 stainless Steel alloy: 
18% chromium, 8% nickel analysis; This Wire has excellent resistance to corrosion from industrial atmospheres; Its higher tensile strength and breaking load are an added benefit; 0.038 in. diameter Type 302 Wire provides strength equal to a .045 in. type 430 Wire with better Ductility (easier bending and unwinding) and better elongation (less chance of Wire breakage from stress)

316 stainless Steel alloy: 
Modified 18-10 analysis containing approximately 2.5% molybdenum; More resistant to the corrosive action of most chemicals, including chlorides and sulfides, than any other Wire; Particularly resistant to pitting and pinhole corrosion of the kind commonly caused by salt spray; Its use provides the best insurance against failure under the most severe atmospheric conditions

Type 430 Stainless
Low carbon, 17% chromium wire
Suitable for general use and in ordinary atmospheric exposure
Will acquire only a dark surface stain
Specifically not recommended for use within 25 miles of salt water or industrial operations that emit pollutants