UN1954 COMPRESSED GAS,FLAMMABLE N.O.S.(METHANE, PROPANE) 2.1 2.5% NITROGEN, 2.0% CARBON DIOXIDE, 1.5% ETHANE, 3.0% PROPANE, 1.0% ISOBUTANE, 1.0% N-BUTANE, 0.5% ISOPENTANE, 0.5% N-PENTANE, 0.3% HEXANES C6+ EXTENDED, 87.7% METHANE BALANCE CERTIFIED, SIZE 350 CUSTOMER OWNED CYLINDER