Visable Propane Level Fiberglass composite materials allow you to actually see how much fuel is left. No more gauges. No more guessing.     30% Lighter than Steel Composite cylinder matches steel for strength but is 30% lighter. And, the plastic housing has handles for easy carrying.     Non-Corrosive Material The plastic casing and fiberglass composite cylinder materials will never rust or corrode. They’re long-lasting and great looking.