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Gel pens are one of the most modern writing tools and are beloved for their strong lines and nice colors. They are used by both professionals and amateurs because of these characteristics. Read more about history of gel pen.
Digital Pens enable users to digitize their writings instantly on real paper, drawings and quick scribblings, share them online or edit them for professional use. Find out much more about this technology here.
Fountain pens replaced standard metal pens because they were easier to use and were less messy. After years of improvements (and after appearance of ballpoint pens which are even easier to use) they became a sort of status symbol. Read more about history of fountain pen.
Highlighters are useful tools: you can use them to mark dates on a calendar, parts of the relevant text in a book or any other use where you need highlight something on paper. Thy influenced our lives so much that we can even find them in some computer programs. Read more about history of highlighters.