Each foot of No-Burst contains 250 feet of stainless steel wire. Non toxic polymer core resists chlorine and chloramines. Tightly sealed cone washers. Easy to grip, exceptionally flexible nickel plated brass hex nuts. Exceeds all plumbing code requirements. Meets agency standards. IAPMO Standard, PS74-95, CSA, SBCCI, FDA, NSF-61, A112.18.6 and UPC. 10 year warranty.