UN1954 COMPRESSED GAS, FLAMMABLE N.O.S., (CARBON DIOXIDE, NITROGEN) 2.1 7% METHANE, 2% HYDROGEN, 1% PROPANE, 1% BUTANE, 0.02% N-PENTANE, 0.1% TRANS-2-BUTENE, 0.1% CIS-2-BUTENE, 0.1% ISOPENTANE, 0.1% 2-METHYL-2-BUTENE, 0.1% 1-PENTENE, 0.1% CIS-2-PENTENE, 16.4% NITROGEN, CARBON DIOXIDE BALANCE CERTIFIED, SIZE 150AL CUSTOMER OWNED CYLINDER