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4.5 (15 reviews)
Uni-ball Signo UM-151 gel ink pens, also known as Signo DX, are known for their smooth writing and exceptional ink quality. And, to everyone's delight, there is a sea of colors and tip sizes to choose from. Find the perfect pen for any task, whether it's writing meticulous notes, marking your calendar, or decorating your scrapbook with colorful captions.

Everything about this pen, from its solid construction to its carefully-formulated ink, ensures a wonderful writing experience. The sturdy tip does not bend or break, even with heavy-handed use. The pigment-based ink flows smoothly and is waterproof, fade-resistant, and feather-resistant. Much of that is due to special viscous properties of the ink. The ink is viscous while in the barrel, but as it passes through the pen tip during writing, the viscosity drops. This results in smooth ink flow. Immediately after it hits the paper, the ink returns to its viscous state, which prevents feathering. You are left with beautiful clean lines that you can enjoy for a long time!

Model NumberUNI UM151.33
Weight0.4 ounces
Body Color Clear
Body Material Plastic
Clip Material Plastic
Clippable Yes
Color Set No
Diameter - Grip 10.3 mm
Diameter - Max 10.3 mm
Grip Color Blue
Grip Material Rubber
Ink Characteristics Waterproof
Ink Refillable Yes
Length - Capped 13.8 cm
Length - Posted 15.3 cm
Length - Uncapped 13.1 cm
Mechanism Capped
Pre-Installed Ink Color Blue
Tip Length 4.4 mm
Tip Material Metal
Tip Size 0.38 mm
Tip Type Conical

Frequently Bought Together

Uni-ball Signo UM-151 Gel Ink Pen - 0.38 mm - Blue - UNI UM151.33
Uni-ball Signo UM-151 Gel Ink Pen - 0.38 mm - Black - UNI UM151.24
Total Price: $5.00
This item: Uni-ball Signo UM-151 Gel Ink Pen - 0.38 mm - Blue - $2.50

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Customer Reviews

The pen was everything...
August 3, 2011
Verified Purchase
The pen was everything i wanted, no scratching, good lines and stable.
1 person found this helpful
Excellent pen for note...
May 11, 2009
Verified Purchase
Excellent pen for note taking! nice, controlled and THIN lines, good size barrel, does not scratch onto paper, etc. This is my favorite pen for note taking for long periods!
1 person found this helpful
It writes thin and smoothly....
July 15, 2015
Verified Purchase
It writes thin and smoothly. I will definitely will purchase this again.
Excellent pen for those...
July 6, 2015
Verified Purchase
Excellent pen for those who like a fine line, but not too fine. Has much more ink capacity than Uni-ball Signo pens available in your ordinary office supply shop. Similar tip though. The grip is useful but not cushiony.

The main difference for me between the Signo and the Hi-Tec C is the tip of the pen. The Hi-Tec has a needle point with some give to it, so if you are prone to writing hard, the Signo might be better. I have not had any ink flow problems with this pen (I had some issues with the Hi-Tec C due to keeping it in the wrong position in my pencil bag).

If you have a heavy hand and like less give on the pen tip, the Signo might be the best choice for you. I haven't really found a difference in ink quality between Signo and Hi-Tec C, but I haven't dumped any water on my writing for a while.
I love this pen. It...
June 19, 2015
Verified Purchase
I love this pen. It is smooth and doesn't bleed or skip. Very dependable. I've given some as little gifts.