I've bought too many sets of these black and white pens to count. I threw away tons of them. When they work, they're amazing, but they don't last long. The tip only fails before I've used 20% of the paint. There is clearly something wrong with the design. The colored ones work better, probably because I use them a lot less, but I've tried four or five of them and they just don't work. The problem is that every other thin drawing pen is even worse.
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