The permanent marker pen is a very practical tool that has the advantages of durability and a wide range of uses. If you need a solid markup tool, this is a great choice.
Sharpie Markers - Black Markers
Water-based, low odor formula Permanently marks most surfaces Chisel shaped tip for narrow and broad lines Ink won't bleed through paper AP certified
Dixon Ticonderoga RediMark Plus Low Odor Permanent Markers, Chisel Point, Set of 4 (95040)
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Competitive Advantage Enamel Paint Markers MPD, YELLOW FINE 1mm - 1 Pack Permanent Markers, 21 Year Permanent, Waterproof UV Res
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