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

Smoothness: okay
Precision: okay
Weight: light
grip feeling: okay
cushion: solid

Overall: Okay. I personally prefer Pilot G-Knock Retractable Gel Ink Pen - 0.38 mm
for better grip and better nonslip feature of the cushion.

This pen is pretty good. The only thing that I don't like about this pen is the ink color. The color to me is not a light blue. Its too dark for me, but it is lighter then a blue color pen.

Nice color, but scratches the paper, maybe at 0.5mm it is more soft on the paper.

I think the Uni-ball Signo DX 0.38mm writes smoothly that this pen. As I try to compare the 2 at the same time, for the DX, the tip glides smoothly as you write. For this pen, the tip comes too sharp that it doesn't glide.

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.