 CNT lengths range from less than 100 nm to 0.5 m.

Individual CNT walls can be metallic or semiconducting depending on the orientation of the lattice with respect to the tube axis, which is called chirality.MWNT's cross-sectional area offers an elastic modulus approaching 1 TPa and a tensile strength of 100 GPa, over 10-fold higher than any industrial fiber.MWNTs are typically metallic and can carry currents of up to 109 A cm−2.