NET beverage cylinders are made by aluminum 6061, with 40% weight reduction than steel cylinders. Unique internal and external treatments provide a superior corrosion resistance assuring gases clean and smelless. Cylinders are made strictly to safety standards all over the word, assuring a consistent and stable performance. High standard quality control and detailed instruction for use & maintenance make sure safety operation and performance. Please google 'NETCYLINDERS'to find our web for more information.