A variety of cylinders to meet all needs and budgets are available in Aluminum, Hoop Wrap, Full Composite, or Carbon Composite. Cylinders are available in 30 minute 2216psi or 30, or 60 minute 4500psi. Low-pressure cylinders can be obtained in Aluminum, Hoop Wrapped, Full Composite or Carbon Composite materials. High pressure 30 minute cylinders are available in Full Composite or Carbon Composite materials; 60-minute cylinders are available in Carbon Composite. Carbon Composite cylinders are the lightest weight cylinders available.