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 company’s conventional mechanical pencils can be paired it with an elegant matching brass pencil box for storage of slender 0.3, 0.5 and 0.7mm leads. Available in titanium, copper, bronze, and ...