Mechanical pencil or they called clutch pencil is a invention of pencil to have the ability to write out the same width every single stroke. Its a improvement of typcial pencil, instead of sharping it every time when the core part is dull. Inside a mechanical pencil contain a mechanic system which allow the user with a simple press to continuing using a single slim lead made by graphic charcoal. Every time when the user ran out the lead they just need to refill it with more lead instead of buying another one.
Here is a detail picture of each individual pieces of mechanical pencil
-picture is from wikipedia.com
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