UN1954 COMPRESSED GAS, FLAMMABLE N.O.S., (METHANE, ETHANE) 2.1 2.50% NITROGEN, 1.00% CARBON DIOXIDE, 5.00% ETHANE, 1.00% PROPANE, 0.30% ISOBUTANE, 0.30% BUTANE, 0.10% 2,2-DIMETHYL PROPANE, 0.10% ISOPENTANE, 0.10% PENTANE, 0.03% HEXANE, METHANE BALANCE CERTIFIED, SIZE 350 CUSTOMER OWNED CYLINDER