This product is a Back-Up Lifeline made with 11 mm (7/16") kernmantle rope, certified to meet ANSI Z359 and Z133, EN 1891 A, and NFPA 1983 standards. It comes pre-sewn with a thimble and swivel snap hook and is available in 30', 50', 100', 150' lengths, as well as custom lengths upon request.