Wave Cyber Co. Ltd., of Shanghai, touts its pressure vessels that are made up of high performance composite material with filament winding. All pressure vessels are 100 percent corrosion resistant. Various thermoplastic liners consist of polyester, high strength polypropylene, etc. The liner wall thickness is available from 3.8 mm up to 7.6 mm corresponding to the vessel diameter. There’s a full choice available up to 36” diameter with 72” height.