Polyfullene
Polybuckminsterfullerene; nanofactured fullerene composite produced originally for Beanstalks but which also found many uses elsewhere. Polyfullene has a tensile strength close to the theoretical limits of molecular matter; a single one millimeter strand can easily support many tons. The most impressive property is that it is self-healing: if the nanotubes inside a Polyful filament are broken, fullerene from the matrix heals them only causing a slight lengthening.
>