UN1956 COMPRESSED GAS, N.O.S. (ARGON, CARBON MONOXIDE) 2.2 3% CARBON MONOXIDE, 2% CARBON DIOXIDE, 1% HYDROGEN, 1% METHANE, 0.50% PROPANE, 0.50% ETHYLENE, 0.50% ACETYLENE, 0.50% PROPYLENE, 0.50% ETHANE, ARGON BALANCE CERTFIED, SIZE 17 LITER DISPOSABLE CUSTOMER OWNED CYLINDER