The pencil “lead” is actually a mixture of graphite and clay. More clay in the mixture makes the lead harder. A harder lead has a higher number. Pencils are numbered from 1-3 but most people use a ...

The archetypal architects’s drawing tool, Staedtler’s clutch pencil was the ubiquitous drafting device in the days before computerization. Still available, this classic pencil takes 2mm leads that can ...

Read Next: Can You Bring Your Art Portfolio on Planes? In general, you can bring pencil lead on United States planes. Pencil ...