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Type 1 cylinders are made completely of steel and are heavy, but less expensive than the other options.

Type 2 cylinders are made of a thin steel liner wrapped in steel wire or an aluminum liner with carbon fiberglass composite wrapped around the middle of the tank so that both the liner and the composite each take 50% of the stress created by the internal pressurization.
Type 3
is a similar concept except that the composite is wrapped around the whole tank so that the metal aluminum lining only bears a small portion of the burden.

Type 4 cylinders are the most expensive type of cylinder but are also the lightest, with a gas tight interior lining and a fully wrapped composite carbon fiber exterior.

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