Made of aluminum alloy 6061, it is manufactured through such procedures as punching, drawing, heat treatment, numerical control spinning, and surface polishing. Compared with steel cylinder, it is of the following superiorities: 1) Weight is reduced by around 30% while with larger storage 2) Purer inside filled gas makes it much safer 3) Can be filled or refilled with various kinds of gases, such as rare gas, highly pure gas, standard gas and special gas 4) Applied widely in the fields of chemical industry, electronic, health care, gas and mining as a substitute to steel cylinder