Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black

While the 0.38mm tip writes fine lines, I am rather disappointed in the ink reservoir. If you pay close attention, the inner diameter on the refill is much smaller than most normal refillable pens which explains why these pens have such a short lifespan. The inner diameter on this refill is 2mm (approximately 3/32”) whereas other pens, like the Zebra Sarasa or the Uni-ball Signo 0.5mm, have a much wider inner diameter. These pens have a 5mm (approximately 5/32”) inner diameter, resulting in 2.5 times more ink than the Signo 0.38mm RT. It’s a great price, especially for those who love super fine tips. Me? I’ll take the extra ink with a 0.5mm tip.

To the guy who is complaining about the reservoir size. It isn't that the .38 size has a smaller reservoir in particular, it's that the retractable signo's as a model have a smaller reservoir. Any size of signo DX models will have the same size reservoir. If you want .38 and still want a big reservoir go look at the .38 signo DXs. They also come in .28 and .5 btw. Anyways, the pen itself has been good to me as all the models of signo I've tried have been. Other than that sometimes not having to worry about a cap can be a good thing. Also, the grip is farther down the pen, which is better for me because I hold pens closer to the tip, which with the Signo DX model is pretty far up so I end up holding past the grip anyways.

Really good pen for quick sketching. Very smooth (it occasionally has a few skips, and it will scratch, but its rare). Only real complaint I have is that the ink runs down really quickly, but then again, it is a gel pen.

I used this kind of uni in my high school (more than 5 years ago), at that time, I thought these gel pens were very good.

However, when using this 0.38 pen today, I think it's kinda of scratching paper. The friction is so uncomfortable to me. I used to have high expectation for uni-signo 207 0.38mm blue/black too, but it turns out they're waste of money.

So far, I could not find any other comfortable, high-quality and elegant writing instruments like Uni-ball Jetstream Ballpoint Pen - 0.7 mm - Alpha Gel Grip Series. I changed all my pencil,ball pens,multiple pens and ink pens to the alpha gel grip ones.

My goodness, what a smooth, creamy line! The only thing that would improve this would be a pivot-clip (like the Zebra pens). I am smitten!