UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (METHANE, NITROGEN) 2.1 0.0998% ETHANE, 0.1004% HEXANE, 0.0998% ISOBUTANE, 0.1000% ISOPENTANE, 0.1000% N-BUTANE, 0.1000% N-PENTANE, 0.1001% NEOPENTANE, 0.0980% PROPANE, 0.9960% CARBON DIOXIDE, 1.046% NITROGEN, 97.1599% METHANE CERTIFIED, SIZE 350