Our NEW Carbon Fiber Cylinders are manufactured SCI. They are built around DOT specifications and have a working pressure of 2216 psig. These cylinders are lightweight, composite cylinders consisting of an aluminum alloy inner shell, with a total over wrap of carbon fiber, fiberglass and an epoxy resin. This cylinder is rated for 30 minutes in duration. SCI’s cylinders are manufactured to the same specifications and standards as our leading new SCBA competitors.