Yes, they have an aluminum liner. The aluminum is structural in the next of the tank, but in the body of the tank it is really just a "sealant" to keep the air inside - the fibers are the structural part of the tank.That said, the fibers on that tank look more like fiberglass than carbon fiber, but material aside that is the way they are constructed. Really cool pics!
Is that aluminum on the inside?
It should have the manufacture date and working pressures on the label affixed to the side of the tank as well as other pertinent info. A pic of the label will help decipher needed info.BD
Is that a crack near the bottom of the cylinder, or something else?Hunter