18 AWG [0.040 in. (1.02 mm)] copper or copper cov ered steel center conductor; gas expanded polyethylene dielectric inner shield aluminum-polypropylene-aluminum laminated tape with overlap bonded to dielectric; outer shield of 34 AWG aluminum or tinned copper wire br aided shield; jacket of polyvinylchloride or polyethylene (flooded). Nominal O.D.O.272 in. (6.91 mm).