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  • Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5
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Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5

4.6 out of 5 stars 1,583 ratings
To see product details, add this item to your cart. You can always remove it later.

Purchase options and add-ons

Brand Uni-Ball
Writing Instrument Form Roller Ball Pen
Colour Black
Ink colour Black
Age range (description) Teen

About this item

  • Uni-ball Signo RT1 Retractable Gel Ink Pen, UMN-155-28
  • The diameter of a lead : Ultra Micro Point 0.28mm, Color : Black Ink
  • Because there is no corner at the pen tip, it is not caught on paper, Smooth ink is also excellent in water resistance and light resistance
  • Value Pack of 5
› See more product details

Product information

Technical Details

Manufacturer ‎Uni-ball
Brand ‎Uni-Ball
Model number ‎SG_B06Y3S2XKL_US
Colour ‎Black
Closure ‎Retractable
Grip type ‎Rubber
Pencil Lead Degree (Hardness) ‎H
Material Type ‎Rubber
Number of Items ‎1
Size ‎5 count (Pack of 1)
Point Type ‎Ultra Fine
Line Size ‎0.3mm
Ink Color ‎Black
Manufacturer Part Number ‎UMN15528.24*5

Additional Information

ASIN B06Y3S2XKL
Customer Reviews
4.6 out of 5 stars 1,583 ratings

4.6 out of 5 stars
鶹 Rank
Date First Available April 30 2017

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Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5

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Product description

Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Black Ink, UMN-155-28, Value Set of 5

Top Brand: Uni-Ball

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Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5
Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5
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Price-5%$12.25
Was: $12.90		-15%$9.95
Was: $11.77		$9.28-15%$11.00
Was: $13.00		$12.00$13.00
Delivery—
Get it by Wednesday, Aug 13
—
Get it by Friday, Aug 15
Get it by Thursday, Aug 14
Get it by Thursday, Aug 14
Customer ratings
4.64.6 out of 5 stars1,583
4.64.6 out of 5 stars623
4.54.5 out of 5 stars15,544
4.64.6 out of 5 stars38
4.44.4 out of 5 stars2,180
4.14.1 out of 5 stars70
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Customer reviews

4.6 out of 5 stars
1,583 global ratings

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Customers say

Customers like the writing quality, smooth writing, and fine lines of the pen. They mention it's nice to write with and makes writing an absolute joy. Customers also appreciate the thinness and versatility of the pen, saying it's excellent for journaling and perfect for work.

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Writing qualitySmooth writingFine linesThinnessVersatility
7 customers mention "Writing quality"7 positive0 negative

Customers like the writing quality of the pens. They mention they're great and nice to write with.

"Nice pens for those who like very fine lines." Read more

"Great pens but the barrel is a bit on the thicker side." Read more

"The pens are nice to write with. The packing when I received the item I was quite disappointed with...." Read more

"I hope this comes in cases and can order more. This pen is awesome." Read more

5 customers mention "Smooth writing"5 positive0 negative

Customers appreciate the smooth writing of the pen. They mention the ink is smooth, no blank spots, and makes writing an absolute joy.

"Writes so well, these will be perfect for work!!" Read more

"These write so nicely. The ink is smooth, no blank spots. Very thin and allows for smaller writing that is still easy to read...." Read more

"I didn’t expect to fall for a pen, but this one—wow. It writes so smoothly, it’s almost addictive...." Read more

"...The tip is very fine as described and a very smooth writer. It never skips (if you hold it very upright) and is super reliable...." Read more

3 customers mention "Fine lines"3 positive0 negative

Customers like the fine lines of the pen. They mention it's nice for those who like very fine lines.

"Nice pens for those who like very fine lines." Read more

"Nice fine lines. Runs out of ink quicker than expected" Read more

"Very fine lines..." Read more

3 customers mention "Thinness"3 positive0 negative

Customers like the thinness of the writing instrument. They mention it allows for smaller writing that is still easy to read.

"These write so nicely. The ink is smooth, no blank spots. Very thin and allows for smaller writing that is still easy to read...." Read more

"Comfortable to write with and very thin." Read more

"Favourite , best thin pen..." Read more

3 customers mention "Versatility"3 positive0 negative

Customers like the versatility of the pens. They mention they're excellent for journaling and perfect for work.

"Writes so well, these will be perfect for work!!" Read more

"I love these pens. I use them everyday to document ideas, take notes, and everything else...." Read more

"Excellent for journaling..." Read more

Amazing
5 out of 5 stars
Amazing
Comfortable to write with and very thin.
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Top reviews from Canada

  • LC
    5.0 out of 5 stars nice pens
    Reviewed in Canada on September 7, 2024
    Verified Purchase
    Nice pens for those who like very fine lines.
    One person found this helpful
    Helpful
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  • Sarah
    5.0 out of 5 stars Writes so well
    Reviewed in Canada on March 26, 2025
    Verified Purchase
    Writes so well, these will be perfect for work!!
    Helpful
     Report
  • Dorkus
    5.0 out of 5 stars Ultra-micro pleasure
    Reviewed in Canada on October 29, 2024
    Verified Purchase
    Great pens but the barrel is a bit on the thicker side.
    One person found this helpful
    Helpful
     Report
  • Devon
    5.0 out of 5 stars My new favourite
    Reviewed in Canada on October 3, 2023
    Verified Purchase
    These write so nicely. The ink is smooth, no blank spots. Very thin and allows for smaller writing that is still easy to read. Very comfortable grip as well. I will definitely be buying these again!
    One person found this helpful
    Helpful
     Report
  • Mr. V
    4.0 out of 5 stars Good
    Reviewed in Canada on October 16, 2024
    Verified Purchase
    Nice fine lines. Runs out of ink quicker than expected
    One person found this helpful
    Helpful
     Report
  • Kira the Toy Maker
    5.0 out of 5 stars Excellent for journaling
    Reviewed in Canada on February 27, 2025
    Verified Purchase
    Ink flow is very good but has a deep color despite the fineness of the line
    Highly recommended to my colleagues who write in special characters in a variety of languages.
    Helpful
     Report
  • Michael R.
    5.0 out of 5 stars Great Pens For Those Who Write Daily!
    Reviewed in Canada on February 2, 2024
    Verified Purchase
    I love these pens. I use them everyday to document ideas, take notes, and everything else. These are the first .28mm pens I have tried, and I am glad that I did.
    One person found this helpful
    Helpful
     Report
  • Kathleen Mac Leod
    3.0 out of 5 stars Not that good
    Reviewed in Canada on July 16, 2025
    Verified Purchase
    Thought is would write nicer. Just not smooth for the price of each pen
    Helpful
     Report

Top reviews from other countries

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  • J. Stevens
    5.0 out of 5 stars Very Point Writing
    Reviewed in the United States on July 14, 2025
    Verified Purchase
    I love these pens. The ink flow is good, no bleeding on my pages, very comfortable in my hand. I like a very fine nib and this pen doesn't disappoint.
    Report
  • RAJENDRA ROHRA
    2.0 out of 5 stars Product below quality
    Reviewed in Saudi Arabia on October 13, 2024
    Verified Purchase
    The ink quality is not good. May be it is dry. With 0.28 tip i wanted to try it. It has a feeling like when the refill is about to finish
    Report
  • Ali Orkun Koparan
    5.0 out of 5 stars Süper ince yazı
    Reviewed in Turkey on June 1, 2024
    Verified Purchase
    0.28 kalemin en zarif hali. Hafif ve pürüzsüz yazmak bu kadar keyifli olmamıştı
    Report
  • KS26
    5.0 out of 5 stars Work great!
    Reviewed in the United States on January 19, 2023
    Verified Purchase
    I'm one of those people who has an unusual obsession with office supplies. As such, I have tried numerous pens in hopes of finding the ~perfect~ pen to use in my everyday life. These are not the ~perfect~ pen; however, they are pretty great regardless. They are comfortable to hold and use thanks to the rubber grip, and the tips are SUPER fine as promised. After using Micron pens for the first time, I found that I favor pens in the .25-.4mm range for writing as the lines are finer and cleaner, and these definitely meet that expectation. So far, I haven't had any issues with bleeding, smearing, skipping, etc. I think it's because the ink comes out so thin, it dries before it even has a chance to smear; but then, I'm also right-handed, so unless I'm especially careless, I don't have many opportunities to smear my writing. I will say that, because the lines obviously come out thinner and therefore somewhat lighter than .5+ pens, people with poor eyesight may struggle to read things written with these .28mm pens, but I wear glasses so it doesn't bother me. Price wise, I think that these are a good deal. They cost about the same amount as the Papermate InkJoy gel pens and Tul gel pens I've been using, but you get more in a pack and the quality is great. Plus, anything finer than .5mm is frustratingly hard to come by. I definitely recommend giving these a try.
    Report
  • nonyadamnbiznes
    5.0 out of 5 stars Great for medical use
    Reviewed in the United States on April 12, 2025
    Verified Purchase
    Amazing pen if you need to write small and still be able to read it.

    I work as an intensivist in a busy MICU and of the substantial number of pens I've used over the years these are by far the best for small detail dense writing. I like to keep a single sheet of paper with me for my patient list and having the ability to pack everything I need to keep track of in a small section of the page only really works with these pens. I have tried 0.25mm pens however they either write too faint or actually cut the paper, something that has never been an issue with these 0.28mm pens.

    Plus the gel ink dries quickly, the pen head glides easily over the page, and the stock pen body is comfortable in hand. A very good value of a pen that out classes ones costing ten times as much.
    Customer image
    nonyadamnbiznes
    5.0 out of 5 stars
    Great for medical use

    Reviewed in the United States on April 12, 2025
    Amazing pen if you need to write small and still be able to read it.

    I work as an intensivist in a busy MICU and of the substantial number of pens I've used over the years these are by far the best for small detail dense writing. I like to keep a single sheet of paper with me for my patient list and having the ability to pack everything I need to keep track of in a small section of the page only really works with these pens. I have tried 0.25mm pens however they either write too faint or actually cut the paper, something that has never been an issue with these 0.28mm pens.

    Plus the gel ink dries quickly, the pen head glides easily over the page, and the stock pen body is comfortable in hand. A very good value of a pen that out classes ones costing ten times as much.
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