UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (METHANE, ETHANE) 2.1 5% ETHANE, 1% PROPANE, 0.3% ISOBUTANE, 0.3% N-BUTANE, 0.1% ISOPENTANE, 0.1% N-PENTANE, 0.1% NEOPENTANE, 0.03% N-HEXANE 2.5% NITROGEN, 0.5% CARBON DIOXIDE, METHANE BALANCE CERTIFIED, SIZE 150AL CUSTOMER OWNED CYLINDER