--- product_id: 63160131 title: "Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set" brand: "uni-ball" price: "€ 33.68" currency: EUR in_stock: true reviews_count: 13 category: "Uni Ball" url: https://www.desertcart.gr/products/63160131-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0 store_origin: GR region: Greece --- # Ergonomic Rubber Grip 10 Vibrant Colors 0.28mm Ultra Micro Point Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set **Brand:** uni-ball **Price:** € 33.68 **Availability:** ✅ In Stock ## Summary > 🖋️ Write Sharp, Stand Out Boldly ## Quick Answers - **What is this?** 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?** € 33.68 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-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0) ## 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 - • **Color Your Creativity:** A curated 10-color set that transforms mundane notes into vibrant expressions of your unique style. - • **Comfort Meets Control:** Soft rubber grip ensures fatigue-free writing during long meetings or brainstorming sessions. - • **Smudge-Free Confidence:** Advanced gel ink technology guarantees no bleed or smudge, keeping your documents pristine and professional. - • **Retractable Convenience:** Sleek retractable design combines portability with instant readiness—no cap, no hassle. - • **Precision in Every Stroke:** Ultra micro 0.28mm tip delivers flawless, detailed writing for professionals who demand clarity. ## Overview The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra micro 0.28mm tip for precision writing. This 10-color value set offers vibrant, smudge-resistant ink with a comfortable rubber grip, designed for professionals seeking flawless, detailed notes and a splash of personality in every page. ## Description Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, UMN-155-28, 10 Color Value Set Review: Flawless and thinnest writing experience possible! - 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! Review: These are the best pens if you like micro point - 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. ## 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 | #22,002 in Office Products ( See Top 100 in Office Products ) #558 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 932 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 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 ![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 ### ⭐⭐⭐⭐⭐ 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! ### ⭐⭐⭐⭐⭐ These are the best pens if you like micro point *by P***E on August 10, 2024* 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. ### ⭐⭐⭐⭐⭐ Great Product *by M***J on March 22, 2026* This product is a fantastic find! It's reasonably priced, making it accessible for most budgets without compromising on quality. The product is exactly as described, and its usefulness cannot be overstated. I've found it to be incredibly practical and efficient in meeting my needs. The attention to detail is impressive, and the performance is on par with more expensive alternatives. If you're looking for something reliable, well-made, and at a fair price point, this is the perfect choice. Highly recommended! ## 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-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0](https://www.desertcart.gr/products/63160131-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-07-21*