A brushed aluminum 5LB Nitrogen/Argon/Helium bottle with the common 580 female valve. Shipped empty. Fill it at your local gas/welding/industrial supply / paintball supply / fire extinguisher service, etc, locations.
WARNING: This product can expose you to a chemical or chemicals such as Talc, which is known to the State of California to cause cancer, birth defects and or reproductive harm. For more information, go to www.P65Warnings.ca.gov.