No.2 pencils are widely used, but you may not know what the number actually refers to. This video explains how pencils developed into their modern form and the significance of the labeled numbers.

to advance the lead, simply click the built-in eraser Great automatic pencil for school, with No. 2 lead that’s compatible with most standardized tests ...

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 number 2. Harder lead makes a lighter mark and softer lead makes ...