A team of researchers at MIT has created a circuit-ready carbon nanotube "lead" pen. The standard pencil uses graphite as a refill, and the name contains lead because people at that time mistakenly thought that graphite was lead, so they called it the lead.
The pencil in the carbon nanotube pencil created by MIT is compressed by single-walled carbon nanotubes. Its appearance and behavior are very similar to that of graphite. The difference is that the pencil of MIT will leave carbon nanotubes on the paper. Good conductivity, conductivity up to 10,000 times that of copper. MIT pencils allow people to draw carbon nanotube circuits on paper to create carbon nanotube sensors.
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