--- product_id: 63160131 title: "Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set" brand: "uni-ball" price: "€ 29.98" currency: EUR in_stock: true reviews_count: 13 category: "Uni Ball" url: https://www.desertcart.gr/products/63160131-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro store_origin: GR region: Greece --- # Ergonomic rubber grip for comfort 10 vibrant gel ink colors 0.28mm ultra micro point for precision Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set **Brand:** uni-ball **Price:** € 29.98 **Availability:** ✅ In Stock ## Summary > 🖋️ Write sharp, write smart—color your success! ## Quick Answers - **What is this?** Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set by uni-ball - **How much does it cost?** € 29.98 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/63160131-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro) ## Best For - uni-ball enthusiasts ## Why This Product - Trusted uni-ball brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pinpoint Precision:** Ultra micro 0.28mm tip delivers crisp, clean lines for flawless notes and sketches. - • **Comfort Meets Control:** Soft rubber grip ensures fatigue-free writing during long meetings or brainstorming sessions. - • **Retractable Convenience:** Smooth retractable design keeps your pen protected and ready to go—no cap, no hassle. - • **Vibrant 10-Color Palette:** Express your creativity or organize your work with a spectrum of bold, fade-resistant gel inks. - • **Trusted Quality & Popularity:** Highly rated with 4.6 stars and a top 600 rank in gel pens—join thousands who trust Uni-ball. ## Overview The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra micro 0.28mm tip for exceptional precision. This 10-color value set offers vibrant, water-based gel inks housed in a comfortable rubber grip body, perfect for professionals who demand both style and performance in their writing tools. ## Description Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, UMN-155-28, 10 Color Value Set Review: Game changer for Left-handers! - 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! Review: Love love love these pens! - So I love these pens. Have a ton of them! I write mostly with the blue/black and black ink. But have every color! Some of the colors like pink and light green and orange aren’t colors I would write with as they are harder to see and read. But I still have good use for them. I study the Bible and these lighter colors come in handy for underlining. So I get to put every pen to use! They are solid! They aren’t to fat or small. Just perfect size for me in writing! I do a ton of writing! I write for work, I study the Bible, planner, notes to others and I take notes a lot, lots of paperwork. I love writing with these pens! And compared to a lot of other pens I have bought (spent tons of money!) These pens are quite a bit cheaper! If you like fine point writing ## Features - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01N6ZE42N | | Additional Features | Retractable | | Age Range (Description) | Adult | | Age Range Description | Adult | | Best Sellers Rank | #24,003 in Office Products ( See Top 100 in Office Products ) #605 in Gel Ink Pens | | Body Shape | Round | | Brand | Uni-Ball | | Brand Name | Uni-Ball | | Closure Type | Retractable | | Color | Black,Blue,Green,Orange,Violet | | Customer Reviews | 4.6 out of 5 stars 946 Reviews | | Drill Point | Ultra Micro | | Grip Type | Rubber | | Hand Orientation | Ambidextrous | | Included Components | 10 Uni-ball Signo RT1 Retractable Gel Ink Pens | | Ink Base | Water | | Ink Color | Black,Blue,Orange,Pink,Red | | Item Diameter | 0.28 millimeters | | Item Dimensions | 5.55 x 4.33 x 0.79 inches | | Line Size | 0_3mm | | Manufacturer | Uni-ball | | Material | Rubber | | Material Type | Rubber | | Model Name | SG_B01N6ZE42N_US | | Model Number | SG_B01N6ZE42N_US | | Recommended Uses For Product | Writing | | Style | Pen | | UPC | 191308004132 | | Unit Count | 10 Count | | Writing Instrument Form | Ballpoint Pen | | Writing Technique | gel ink | ## Product Details - **Age Range (Description):** Adult - **Brand:** Uni-Ball - **Color:** Black,Blue,Green,Orange,Violet - **Ink Color:** Black,Blue,Orange,Pink,Red - **Writing Instrument Form:** Ballpoint Pen ## Images ![Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set - Image 1](https://m.media-amazon.com/images/I/71WrPPU+KPL.jpg) ## Questions & Answers **Q: Do these bleed through on Bible pages?** A: I don't know the answer to that, but I wouldn't even TRY them in my bible (and I'm a Bible journaler!). I use prismacolor colored pencils in all my Bibles. **Q: Where can I buy refills for this pen?** A: You should be able to purchase refills here on Amazon **Q: Can you right on a rock with these?** A: I have not tried to do so, and I really doubt that fine of tip would work very well. I guess I would experiment to see if you could. They do make pens especially for writing and painting on rock. I would recommend that type of pen, but try these to see. **Q: Has anyone colored with these?** A: My uni ball Signo RT1 collection of color gel pens are of 0.28 mm fineness. They are very very fine point. At such fine point, I think you can only write with it. I think it will be hard to color anything with it. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Game changer for Left-handers! *by K***L on January 3, 2023* 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! ### ⭐⭐⭐⭐⭐ Love love love these pens! *by R***A on March 19, 2025* So I love these pens. Have a ton of them! I write mostly with the blue/black and black ink. But have every color! Some of the colors like pink and light green and orange aren’t colors I would write with as they are harder to see and read. But I still have good use for them. I study the Bible and these lighter colors come in handy for underlining. So I get to put every pen to use! They are solid! They aren’t to fat or small. Just perfect size for me in writing! I do a ton of writing! I write for work, I study the Bible, planner, notes to others and I take notes a lot, lots of paperwork. I love writing with these pens! And compared to a lot of other pens I have bought (spent tons of money!) These pens are quite a bit cheaper! If you like fine point writing ### ⭐⭐⭐⭐⭐ Flawless and thinnest writing experience possible! *by K***E on October 7, 2025* 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! ## Frequently Bought Together - Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set - Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 - UPENOTE Gel Pens 0.28mm Extra Fine Point Pen, Black Ink, Ball Point Pen for School, Office, Stationery Supplies 6 Packs --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/63160131-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro](https://www.desertcart.gr/products/63160131-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-10-18*