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What are Mechanical Pencils?

A mechanical pencil, also referred to as a retractable pencil, clutch pencil or propelling pencil, is a variant of a standard pencil, except that the lead is not fused to the outer casing but moves down the hollow centre of the pencil. As the lead point is worn away through use, the lead inside the pencil is mechanically pushed forward using a lead-dispensing mec...