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 |