Cylinders of sizes 80 cft ( 11,1L) and 40 cft (5,8 L) are beeing preferred as the first choice for stage bottles by the technical diver, because of its excellent buoyancy properties . The cylinders are manufatured in the US and conform to the standards of the European Pressure Equipment Directive. They have a thread M25x2 and are available with a white finish, or brushed with a clear coat and as natural cylinders without coat. "Dirty Beast"