Helium tank cylinders are normally made of aluminum. Cylinders made with aluminum are around 40 percent lighter than steel manufactured tanks. Westwinds is a common brand of helium cylinders and weighs around 14 to 40 LBS.
|Westwinds Aluminum Cylinders||Weight|
|27 Cubic Foot Tank||14 LBS|
|55 Cubic Foot Tank||26 LBS|
|125 Cubic Foot Tank||40 LBS|