***** Niobium Tubes Niobium Capillary Material: Pure Niobium, Niobium content: 99.95, 99.99. Type: Seamless tube, Welded tube Size: (1.0-80.0mm) Outer Diameter, Wall Thickness: 0.2-5.0, L: 500-5000mm Application: Niobium is used for steel alloys, arc welding, and superconductivity research. Pls visit three w dot pengfatrading dot com to learn more information. Pls contact me via. Sales AT Pengfatrading DOT com directly, thank you.