--- product_id: 272905299 title: "Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5" brand: "uni-ball" price: "€ 26.24" currency: EUR in_stock: true reviews_count: 5 url: https://www.desertcart.sk/products/272905299-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0 store_origin: SK region: Slovakia --- # comfortable rubber grip water & light resistant ink 0.28mm ultra micro point Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 **Brand:** uni-ball **Price:** € 26.24 **Availability:** ✅ In Stock ## Summary > 🖋️ Write sharp, write smart — the pen that means business. ## Quick Answers - **What is this?** Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 by uni-ball - **How much does it cost?** € 26.24 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/272905299-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 - • **Effortless Comfort:** Ergonomic rubber grip designed for extended use without hand fatigue—write smarter, not harder. - • **Smudge-Proof Confidence:** Water and light resistant gel ink ensures your writing stays crisp and vibrant all day long. - • **Sleek Retractable Design:** No cap, no hassle—quickly deploy your pen and stay productive on the go. - • **Precision in Every Stroke:** Ultra micro 0.28mm tip delivers razor-sharp, clean lines for flawless note-taking and detailed work. - • **Value Pack for the Ambitious:** Set of 5 pens keeps you stocked and ready to impress in meetings, brainstorming sessions, and beyond. ## Overview The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra-fine 0.28mm tip for precise, clean writing. Its water- and light-resistant ink guarantees durability, while the rubber grip ensures comfort during long writing sessions. Sold in a convenient value pack of five, this pen is perfect for professionals who demand reliability and style in their everyday tools. ## Description Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Black Ink, UMN-155-28, Value Set of 5 ## Features - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | Additional Features | Retractable | | Age Range Description | Teen | | Animal Theme | no animal theme | | Asin | B06Y3S2XKL | | Best Sellers Rank | #57,638 in Office Products (See Top 100 in Office Products) #1,318 in Gel Ink Rollerball Pens | | Body Shape | Round | | Brand Name | uni-ball | | Closure Type | Retractable | | Color | Black | | Customer Reviews | 4.6 4.6 out of 5 stars (1,835) 4.6 out of 5 stars | | Drill Point | Ultra Fine | | Grip Type | Rubber | | Hand Orientation | Ambidextrous | | Hardness | HB | | Included Components | Ecology Sticky Notes | | Ink Base | Water | | Ink Color | Black | | Item Diameter | 0.28 Millimeters | | Item Dimensions | 15 x 5.5 x 2 centimeters | | Item Weight | 59 g | | Line Size | 0.3mm | | Manufacturer | uni-ball | | Material Type | Rubber | | Model Name | Uni-ball Signo RT1 | | Model Number | SG_B06Y3S2XKL_US | | Recommended Uses For Product | Home, School | | Style | Modern | | Unit Count | 5.0 Count | | Upc | 191308002770 | | Water Resistance Level | Water Resistant | | Writing Instrument Form | Roller Ball Pen | | Writing Technique | Gel Ink | ## Product Details - **Age range (description):** Teen - **Brand:** uni-ball - **Colour:** Black - **Ink colour:** Black - **Writing instrument form:** Roller Ball Pen ## Images ![Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 - Image 1](https://m.media-amazon.com/images/I/41G6JyrC6SL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ favourite ballpoint *by on Reviewed in Canada 16 September 2026* love these pens, they are my favorite for writing in my tiny moleskine dayplanner. simple construction, nice smooth ink flow but fun scratchy feeling when writing, ink is dark and never smudges. comfortable to write with with small hands. lines are crisp and super thin, great for drawing small things with lots of hatching. pen click when you retract it is nice as well. big fan, have been ordering replacement ink cartridges for my original ones for a couple years now too so they are pretty durable. only gripe is the refills always seem underfilled but thats not a problem with the pens themselves. ### ⭐⭐⭐⭐⭐ Great pen! *by on Reviewed in Australia 29 November 2025* I usually use a 0.38mm tip so it took me a while to get used to the 0.28mm tip but now I use it all the time. The pen writes smoothly and dries quickly. ### ⭐⭐ Product below quality *by on Reviewed in Saudi Arabia 13 October 2024* 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 ## Frequently Bought Together - 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 - Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set --- ## 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.sk/products/272905299-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0](https://www.desertcart.sk/products/272905299-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-10-04*