Our line of Silica (glass) fiber-wrapped cylinders (CFF) have an aluminum core with a fiber wrap. They are DOT-E 7277-3000 rated.
This is a 3,000psi cylinder and requires Hydrostatic testing every 3 years from date of manufacture.
It has a 15 year life limit.
Note: This cylinder is generally used in European applications where it can be filled to 3,000 psi (207 bar)
Generally filling in the US is limited to 2,200 psi.