Uni-Ball

Uni-ball Signo RT1 Retractable Gel Ink Pen Ultra Micro Point 0 28mm Rubber Grip UMN-155-28 10 Color Value

523+ bought in the past month

$16.98$19.99
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About this item

  • Smooth and easy to write
  • 10 Color Set: black, red, blue, baby pink, orange, lime green, green, light blue, blue black, violet.
  • Uni-ball Signo RT1 Retractable Gel Ink Pen, UMN-155-28
  • Ultra Micro Point 0.28mm
$16.98
Was $19.99Save $3.01

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Product details

BrandUni-Ball
Writing Instrument FormBallpoint Pen
ColorBlack,Blue,Green,Orange,Violet
Ink ColorBlack,Blue,Orange,Pink,Red
Age Range (Description)Adult

Technical specifications

manufacturerUni-ball
brandUni-Ball
item_weight3.7 ounces
product_dimensions5.55 x 4.33 x 0.79 inches
item_model_numberSG_B01N6ZE42N_US
is_discontinued_by_manufacturerNo
colorBlack,Blue,Green,Orange,Violet
closureRetractable
grip_typeRubber
material_typeRubber
number_of_items10
size1 Count (Pack of 10)
point_typeUltra Micro
line_size0_3mm
ink_colorBlack,Blue,Orange,Pink,Red
manufacturer_part_numberUMN15528.10C
best_sellers_rank#34,104 in Office Products ( See Top 100 in Office Products ) #846 in Gel Ink Pens
date_first_availableFebruary 28, 2017

Product videos

Product video 1

Customer reviews

4.6906 ratings

Customers say

Customers find these pens excellent for drawing and appreciate their rich colors, with one customer noting that lighter shades have good visibility. Customers disagree on the writing thickness and ink flow, with some finding them too thin and having issues with ink not flowing properly.

★★★★★

Flawless and thinnest writing experience possible!

Keegan WocheOctober 7, 2025✓ Verified purchase

A lefty’s dream come true! No bleed, no smudge, perfectly smooth ink for ALL colors. I have no notes. I wish I had a million of these and never had to use another pen. The black is classic and I’m blown away by the smoothness of these colors! Please never stop making these, Uni-ball! Read more

Review image 1
★★★★★

Great for detail work

SLJanuary 12, 2026✓ Verified purchase

Great pens for detailed art work Read more

★★★★★

These are the best pens if you like micro point

PouletteAugust 10, 2024✓ Verified purchase

Fun colors and the tiny points mean you can write a lot in small spaces. So far, no leaking, no ink interruption, no ink blobs, and they flow so smoothly and consistently. They are sturdy and not slippery. I hope they never stop making these micro point pens. Read more

★★★★★

Game changer for Left-handers!

Kat VanderpoelJanuary 3, 2023✓ Verified purchase

I’m a lefty! If you are too, I feel your pain. These pens are amazing! No smearing, which means the entire side of your left hand won’t be completely covered in ink after hours of note taking! We also write teeny tiny. The pens are so sharp and smooth it makes your hand-writing incredibly neat and precise. The best part is, it’s not limited to black and blue! The blue comes in 3 diff shades, although I do feel like the lighter colors in the pack are not intense enough to write but they are fine for underlining, starring, etc. The purple, black, red, and dark blues (2 diff shades) are all great! 10/10 for the lefties. I’m about to make my 4th purchase. I’m officially addicted! Read more

★★★★☆

They didn't send all 10 Pens! I only received 8!😫😫😫

Karen S. BrownFebruary 26, 2025✓ Verified purchase

I LOVE these pens! Let's make that clear! But like someone else who wrote a review, and complained, I also received only 8 pens from this merchant!!! I don't know what is going on here, but I was shorted a PINK and a BLACK pen, leaving me with only 8 in my set. I wasn't very pleased with that!!! I contacted Signo directly, but never heard back from them, so I'm not certain who's responsible for packaging the sets...Signo or, the merchant. I love writing with these pens! I have extremely small penmanship! It's not much larger than this lettering. The only thing I could ask for is more ink in the pen, to begin with.🙄 The Hi-Tech 0.25 that are my absolute favorite, have ink that extends over an inch higher (I measured). These color pens have ink which only measures 3.25" up the length of the 5.50" pen. It won't stop me from purchasing this pen, after all, I love the consistent quality of the line width between the colors... That had been a problem with another brand before🤔. The pens are comfortable to hold, which is important, if you have arthritis like I do! The main complaint I have, is they aren't sending out what they are posting on the website on Amazon! I'm NOT the first to complain about this! The merchant needs to update the posting on Amazon, or send out the 2 pens to EVERY single customer who was shorted. Happy writing!🖊 Read more

★★★★★

Fine and clean!

Martin_J40February 16, 2026✓ Verified purchase

Outstanding product. Uni-ball makes exceptional gel pens especially the ultra fine ones. Poor shipping: Ordered from DRAWER PLUS. Read more

★★★★★

Love love love

SwishsplashAugust 6, 2025✓ Verified purchase

Fine point and smooth writing Read more

★★★★★

Great Vibrant Pens

MinnieJanuary 21, 2024✓ Verified purchase

My first impression of the product could have been better. All the pens came in a tied-up plastic bag. I was expecting them to come in a plain box, at least. But that's besides the functionality of the pens themselves. All the pens came with their tip seals. They all have nice grips and clicks as well. They all have nice shades of colors and wrote well on paper. Due to their extra fine tips, they do drag on the paper just a bit. Slight smudge if left to dry for 1 second, and even less after 5 seconds. Withstand highlighter relatively well, and does rub off minimally with an eraser. Read more

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