There are both seamless and non-seamless tubes in the market, so telling the difference between the two is important. Our seamless aluminum tube for hydrogen fuel vehicles is made of very reliable aluminum alloys 6061-F and 6061-H112. We use indirect extrusion, which produces flawless tubes. The biggest advantage of the seamless tube is the higher capability to bear pressure compared to non-seamless or welded versions. This large-diameter tube has a uniform texture. It also doesn’t have the flaws to the mechanical properties that you expect in welded tubes.