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Usually, these mechanical pencils are made of metal or plastic. They have a hollow body in which the mine is placed and, thanks to different mechanisms, they allow us to move it forward at will. When our mine is finished we will simply have to add a new spare part and that's it. The most normal is that we opt for gray graphite mines of different thicknesses. But, we need it, we can also find options for other colors.

Best mechanical pencils