Steel "Blue Ribbon” (BR) is a UL listed non-jacketed flexible steel conduit has many universal wiring applications. It is often referred to as “Greenfield” or “Reduced Wall Flex”. This conduit is intended for installation as a metal raceway for wires and cable in accordance with the NEC (ANSI/NFPA-70). Article 348. Markets include: Construction, Data Centers, Fixture Whips, Security, Utilities, Wastewater Treatment This is 4in x 100ft Spooled, Flexible Type BR Conduit conduit.