Darkest black of any pen I've written with! Doesn't write as smooth as the Fischer Space Pen refills, but overall it works more consisten...

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Slightly scratchier than same-sized EnerGel refill. Thick, bold black lines. Fully waterproof, dries instantly. Can feather slightly on c...

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This is an update to my previous review. My previous cartridge must have been defective, JetPens contacted me and even after I had thrown...

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I love Kaweco’s Sport rollerball pens. I have more than I probably should but they write beautifully, they’re comfortable to hold and the...

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It's great ink for my favorite pen, BUT the refill packs do not include the tension spring that makes it work in this series of pen. You ...

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This is what makes the Kaweco sport pens such a fun pen to carry around. Reliable and satisfying steel tip with the perfect line. I also ...

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love how inky and smooth it is, esp since i've had trouble finding a parker refill i actually like for my rotring 600! not even usually a...

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I love your pens but I am putting 4 stars because the ink runs out fairly quickly. I do write everyday so it may just be my over use but ...

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A German product , worthy of your consideration. Give it a try you can not go wrong. This company has been around for a long time. Produc...

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