Abstract: Electrical or electro-mechanical apparatuses are disclosed that include a plurality of superconducting nanotubes or a plurality of superconducting nanotube bundles, especially superconducting carbon nanotubes and a stabilizing means or structure, where the nanotubes are maximally proximate and where the means stabilizes the nanotubes to increase mechanical durability. Methods of sorting nanotubes based on their conductive properties are also disclosed.