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4.5 (4 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 UM151.6
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 Green
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 Green
Tip Length 4.4 mm
Tip Material Metal
Tip Size 0.38 mm
Tip Type Conical

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Customer Reviews

good color...
June 16, 2015
Verified Purchase
good color
I purchased this colour...
May 8, 2015
Verified Purchase
I purchased this colour to use for grading papers instead of red. The green really stands out and I think the 0.38 mm size is perfect.
The fine of a point so...
March 3, 2015
Verified Purchase
The fine of a point so it doesn't write as smoothly as I thought it would.
i compared this pen with...
October 3, 2012
Verified Purchase
i compared this pen with it's .28 sibling, as well as a .4 hitec-c and a .3 hitec-c on the following paper types:

- doane graphed notepad
- moleskin lined notepad (best)
- crappy ol' yellow notepad

for those of us (like myself) that have bigger, sloppier, faster handwriting, the finer-tip pens start to get scratchy regardless of the notepad you're writing on - for meetings and lectures (where i needed to be able to scribble fast and large) i found myself reaching for a ball-point (like a jetstream, or a crappy bic) over any of the pens i listed.

however, during a brainstorm or casual notetaking, this pen is a dream, and i found myself swapping between this and the other pens i listed above pretty regularly - it's impossible for me to rank one over the others, they're all fabulous!

buy one or all of them, you won't be sorry. for the record: the moleskin paper was a dream to write on (over the other two I listed.)