High Bursting strength, each foot of No-Burst contains 250 ft of stainless steel wire. Stainless ferrules are extra-long with added crimps for added security. Non-toxic polymer core resists chlorine and chloramines. Captive cone washers seal tightly. Exceptionally flexible for fast easy installation. Won't kink or crease in the tightest of spaces. Easy to grip, nickel plated brass hex nuts. Meets agency IAPMO standard, SBCCI, CSA, NSF-61-9, A112.18.6 and UPC.