UN1956 COMPRESSED GAS, N.O.S. (ARGON, NITROGEN) 2.2 100 PPM ACETYLENE, 100 PPM CARBON DIOXIDE, 100 PPM CARBON MONOXIDE, 100 PPM ETHANE, 100 PPM ETHYLENE, 100 PPM METHANE, 100 PPM HYDROGEN, 20,000 PPM OXYGEN, 45,000 PPM NITROGEN, ARGON BALANCE CERTIFIED, SIZE 33AL