These compact, ilghtweight aluminum cynlinders are recommended for gas mixtures that are not stable in steel cylinders. Typical components blended in these packages include amonia, chlorine, hydrogen sulfide, nitric oxide, nitrogen dioxide, and sulfur dioxide. They are available in capacities from 11 liters (0.4 cu. ft.) to 116 liters (4.0 cu. ft.). More varieties available. Call for other formulations and blends.