A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "pencil lead" (), which is often made of graphite and not bonded to the outer casing, thus the user can mechanically extend it, as it is worn away from use. Mechanical pencils often include erasers.
A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "pencil lead" (), which is often made of graphite and not bonded to the outer casing, thus the user can mechanically extend it, as it is worn away from use. Mechanical pencils often include erasers.
Source: Wikipedia "Mechanical pencil" · CC BY-SA 4.0
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