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Known for its smooth writing, exceptional ink quality, and outstanding selection of colors and tip sizes, the UM-151 (also known as the Signo DX) is one of our all-time favorite gel pens. Find the perfect one 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 water resistant, fade resistant, and feather resistant. Much of this great performance is due to the special viscous properties of the ink. As the ink passes through the pen tip during writing, the viscosity drops to provide smooth ink flow. But immediately after it hits the paper, the ink returns to its viscous state to prevent feathering. You are left with beautiful clean lines that you can enjoy for a long time!
| Model Number | UNI UM15128.64 |
| Manufacturer | Uni |
| Body Color | Clear |
| Body Material | Plastic |
| Capped or Retractable | Capped - Snap On |
| Clip Material | Plastic |
| Clippable | Yes |
| Diameter - Grip | 10.3 mm |
| Diameter - Max | 10.3 mm |
| Grip Color | Dark Blue |
| Grip Material | Rubber |
| Ink Characteristics | Acid-Free, Archival Quality, Fade-Resistant, Fraud Prevention |
| Ink Composition | Pigment-Based, Water-Based |
| Ink Refillable | Yes |
| Length - Capped | 13.8 cm / 5.4 inches |
| Length - Posted | 15.3 cm / 6.0 inches |
| Length - Uncapped | 13.1 cm / 5.2 inches |
| Pre-Installed Ink Color | Dark Blue (Blue Black) |
| Tip Material | Metal |
| Tip Size | 0.28 mm |
| Tip Type | Conical |
| Water-Resistant | Water-Resistant |
| Weight - Barrel (with Ink) | 0.33 oz / 9 grams |
| Weight - Cap | 0.08 oz / 2 grams |
| Weight - Whole Pen (with Ink) | 0.41 oz / 11 grams |
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WARNING: This product can expose you to chemicals including phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. www.P65Warnings.ca.gov |
Q: How do I open a Uni-ball Signo Gel Pen to insert a refill?
To open a Uni-ball Signo Gel Pen, you must remove the metal tip:
1) Wrap a rubber band around the metal tip of the pen.
2) Using the grip provided by the rubber band, unscrew the metal tip.
1) Wrap a rubber band around the metal tip of the pen.
2) Using the grip provided by the rubber band, unscrew the metal tip.
Q: Can this pen be used on black or dark colored paper or over watercolors?
No, this Uni-ball Signo UM-151 gel pen's ink is not opaque enough to show up well on black or dark colored paper, and it cannot be used over watercolors.
Frequently Bought Together
This item: Uni-ball Signo UM-151 Gel Pen - 0.28 mm - Blue Black - $2.85
Total Price: $5.70
Customers Who Bought This Item Also Bought
Product Specifications
| Model Number UNI UM15128.64 |
UNI UM15128.64 |
| Manufacturer Uni |
Uni |
| Body Color Clear |
Clear |
| Body Material Plastic |
Plastic |
| Capped or Retractable Capped - Snap On |
Capped - Snap On |
| Clip Material Plastic |
Plastic |
| Clippable Yes |
Yes |
| Diameter - Grip 10.3 mm |
10.3 mm |
| Diameter - Max 10.3 mm |
10.3 mm |
| Grip Color Dark Blue |
Dark Blue |
| Grip Material Rubber |
Rubber |
| Ink Characteristics Acid-Free, Archival Quality, Fade-Resistant, Fraud Prevention |
Acid-Free, Archival Quality, Fade-Resistant, Fraud Prevention |
| Ink Composition Pigment-Based, Water-Based |
Pigment-Based, Water-Based |
| Ink Refillable Yes |
Yes |
| Length - Capped 13.8 cm / 5.4 inches |
13.8 cm / 5.4 inches |
| Length - Posted 15.3 cm / 6.0 inches |
15.3 cm / 6.0 inches |
| Length - Uncapped 13.1 cm / 5.2 inches |
13.1 cm / 5.2 inches |
| Pre-Installed Ink Color Dark Blue (Blue Black) |
Dark Blue (Blue Black) |
| Tip Material Metal |
Metal |
| Tip Size 0.28 mm |
0.28 mm |
| Tip Type Conical |
Conical |
| Water-Resistant Water-Resistant |
Water-Resistant |
| Weight - Barrel (with Ink) 0.33 oz / 9 grams |
0.33 oz / 9 grams |
| Weight - Cap 0.08 oz / 2 grams |
0.08 oz / 2 grams |
| Weight - Whole Pen (with Ink) 0.41 oz / 11 grams |
0.41 oz / 11 grams |
|
WARNING: This product can expose you to chemicals including phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. www.P65Warnings.ca.gov |
Customer Reviews
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This pen has a stronger...September 12, 2010Verified PurchaseThis pen has a stronger tip and better ink than others. I've tried the Hybrid Technica and Hi-Tec-C pens and I disliked how fragile their tips were, you feel like you're going to break it if you write too fast. In addition, the ink from this pen dries significantly faster than the others', which is really nice if you're going to be writing on a semi-glossy surface like taking notes in a textbook, writing a card, or writing left-handed. After I tried this pen, I never bothered trying another manufacturer's again.9 people found this helpfuldarby
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I bought this along with...September 14, 2006Verified PurchaseI bought this along with a 0.25mm Pilot Hi-Tec-C; I've used almost half of the ink Signo DX and almost none of the Hi-Tec-C. The reinforced tip on the Signo makes it much easier to write quickly without skips in the ink. The ink dries very quickly, which is also a nice feature. I also have an fairly unused Pentel Hybrid Technica 0.3mm which stays unused due to the same weak tip as the Hi-Tec-C and its slow drying ink.
The blue-black ink appears black, even if you're looking at it hard. I'd recommend getting a lighter blue if you want blue looking ink.6 people found this helpfuldarby -
This pen is fantastic....September 26, 2011Verified PurchaseThis pen is fantastic. Due to a previous person's review stating that the pen was too scratchy I bought this .28 size and the .38 size. While the pen does have a scratchy quality due to the small size I found that I acually liked the drag on the paper and that my handwriting was far more legible.
The black - blue color ink is a great mix of the two colors, that also looks unique.
The pen ink lasted a lot longer than I had expected, and that was with daily all day use. I will definitely be buying this pen again.5 people found this helpfulgsaravia -
I love these pens. Bought...October 7, 2006Verified PurchaseI love these pens. Bought a few in Europe and couldn't find any here in the States. Thank you, JetPens!!
The ink is very quick to dry, it will never skip or sploch. Nor will it leak if left in contact with paper or clothing. Amazing writing instrument for those who wish to keep neat, fine print.
One thing to look out for is how fragile these pens are. Because of the precision design, the ballpoint is easily damaged. This isn't to say that this pen won't last you till it's dry, but don't drop it on the tip. I broke two like this =\. Gotta kick my twirling habit.
Overall: Best writing instrument evar.3 people found this helpfulbutonemike -
My go-to pen in graduate...April 27, 2013Verified PurchaseMy go-to pen in graduate school! After failing with the Uni-ball Signo UM-201 0.18 mm gel ink pens, I moved up to this 0.28 in blue black, black, and regular blue. I loved these pens for quick class notation and studying for exams. These pens saved my wrist during the infamous "blue book" tests that you typically find in humanities and social science classes. Ball points, which most students use during those strenuous writing feats, cause great pain and soreness afterwards. This pen is truly a great basic pen, and I recommend these when blue or black ink is required for a lengthy writing task.1 person found this helpfulanneliesemae