I was given a "factory tour" by Dave - one of the Paketa founders. He lives (or lived) about 2 miles from me. About 2 years ago it was in a barn in Lafayette, Colorado. I think they may have since expanded to larger facilities. They basically just found a company that will extrude magnesium using custom dies, order the tubing, cut to length, cope the ends and weld in a jig. Really no different from aluminum or steel. Pretty neat to see low-volume manufacturing still surviving in the US.