Since Muji has only a handful of retail locations in the United States, I make sure to visit whenever I’m in proximity to one. So when I was in New York a couple of weeks ago, I hit up their SoHo location and picked up a few fresh Muji pens, including this $1.50 gel. If you know Muji, then you’re probably familiar with the company’s “no-brand” products. Unlike your BIC Cristals and Pilot G2s, this pen doesn’t really have a name, but it’s simply referred to as a “Smooth Writing Gel Pen.” Though there’s a little bit more to it than that.
Unlike the standard Muji gel pen I sometimes see in the wild, this pen is retractable and has a handy spring-loaded clip. It has a good, dark gel ink that doesn’t smear too much, and as the name suggests, it is a smooth writer. It is also a reliable writer, so you wont be bothered by ink that skips out. If you’ve ever used a Zebra Sarasa Clip, this pen will feel very familiar (in fact, it’s likely that Zebra clandestinely produces this pen for Muji).
My only complaint with Muji’s Smooth Writing pen is that I don’t really like the grip section – the rubber grip has an odd “pencil eraser” feel to it. Though, admittedly, this doesn’t bother me so much as to make me stop using the pen.
If you’re going to be at a Muji store any time soon, then maybe grab one or two of these on your way to the check-out. Otherwise, if you’re looking for a decent gel pen with a spring loaded clip, then it’ll probably be easier to find a Zebra Sarasa Clip instead. You’ll hardly notice the difference anyway.

Do you know what the colorless liquid on top of the ink is? Is it toxic?
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I believe it’s a silicone grease to keep the ink from spilling out. I believe it is non-toxic, but I wouldn’t eat it.
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