--- 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: "¥4674" currency: JPY in_stock: true reviews_count: 13 category: "Uni Ball" url: https://www.desertcart.jp/products/63160131-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0 store_origin: JP region: Japan --- # ergonomic rubber grip 10 vibrant gel ink 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:** ¥4674 **Availability:** ✅ In Stock ## Summary > 🖋️ Write Sharp, Stand Out: The Pen That Means Business ## 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?** ¥4674 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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 - • **Retractable & Ready:** Sleek retractable design keeps your pen protected and ready to impress—no cap, no hassle. - • **Color Your Creativity:** 10 vivid gel ink shades to brighten notes, plans, and presentations with a splash of personality. - • **Comfort Meets Control:** Ergonomic rubber grip designed for all-day writing comfort, perfect for lefties and righties alike. - • **Smudge-Free Confidence:** Quick-dry, water-based gel ink ensures clean, sharp lines—no smears, no mess, just pure clarity. - • **Precision in Every Stroke:** Ultra micro 0.28mm tip delivers flawless, detailed writing for professionals who demand perfection. ## Overview The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra micro 0.28mm tip for precise, smudge-free writing. This 10-color value set offers vibrant, quick-drying gel inks housed in a comfortable rubber grip body, designed for ambidextrous use. Ideal for professionals seeking a reliable, stylish pen that elevates everyday writing tasks. ## 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: Great Product - 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! ## 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 | #35,369 in Office Products ( See Top 100 in Office Products ) #807 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 927 Reviews | | Drill Point | Ultra Micro | | Grip Type | Rubber | | Hand Orientation | Ambidextrous | | 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 Number | SG_B01N6ZE42N_US | | Recommended Uses For Product | Writing | | Style | Pen | | UPC | 191308004132 | | Unit Count | 10 Count | | Writing Instrument Form | Ballpoint Pen | ## 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! ### ⭐⭐⭐⭐⭐ 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! ### ⭐⭐⭐⭐⭐ 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. ## 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.jp/products/63160131-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0](https://www.desertcart.jp/products/63160131-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-17*