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Porous point pen
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A porous point pen contains a point that is made of some porous material such as felt or ceramic.
A high quality drafting pen will usually have a ceramic tip, since this wears well and does not broaden when pressure is applied while writing. Draftsman's pens are usually fairly expensive.
For example, Liquid Expresso is a felt-tipped porous point pen made by PaperMate.

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Encyclopedia
A porous point pen contains a point that is made of some porous material such as felt or ceramic.
A high quality drafting pen will usually have a ceramic tip, since this wears well and does not broaden when pressure is applied while writing. Draftsman's pens are usually fairly expensive.
For example, Liquid Expresso is a felt-tipped porous point pen made by PaperMate.
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