{"product_id":"uni-signo-umn-155-retractable-gel-pen","title":"Uni-ball Signo UMN-155 Retractable Gel Pen","description":"\u003ch2\u003eSmooth, Scratch-Free Precision for Everyday Writing\u003c\/h2\u003e\n\u003cp\u003eThe Uni-ball Signo UMN-155 (Signo RT1) redefines the gel pen writing experience with its innovative edge-less tip design. Engineered to eliminate paper friction, the rounded tip collar glides seamlessly across notebook pages and exam sheets without catching or scratching fibers, even at steep writing angles. Packed with Uni's proprietary archival pigment gel ink, each stroke delivers deep, rich lines that dry rapidly and resist fading, water, and bleed-through.\u003c\/p\u003e\n\u003cp\u003eDesigned for students, planners, and professionals alike, the streamlined barrel incorporates an ergonomic rubber grip that extends smoothly to the tip, providing fatigue-free control during marathon study sessions and fast-paced lectures.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEdge-Less Tip Geometry:\u003c\/strong\u003e Specially rounded tip housing reduces friction against paper surfaces for exceptionally low writing resistance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArchival Super Ink:\u003c\/strong\u003e Pigment-based formula binds strongly with paper fibers, offering water resistance, lightfast permanence, and fraud prevention.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuick-Drying \u0026amp; Smear-Resistant:\u003c\/strong\u003e Formulated to minimize smudges, making it an ideal tool for left-handed writers, bullet journaling, and timed exams.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Ergonomic Grip:\u003c\/strong\u003e Continuous rubber contour provides a firm, comfortable hold without ridge pressure points.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConvenient Retractable Design:\u003c\/strong\u003e Sturdy push-button click mechanism ensures quick one-handed deployment and prevents accidental pocket leaks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Uni-ball (Mitsubishi Pencil)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e UMN-155 (Signo RT1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Retractable Gel Ink Pen\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTip Sizes:\u003c\/strong\u003e 0.38 mm \/ 0.5 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInk Chemistry:\u003c\/strong\u003e Water-based pigment gel ink\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBarrel Material:\u003c\/strong\u003e Polycarbonate with molded rubber grip\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Refills:\u003c\/strong\u003e Uni UMR-85N (0.5 mm) \/ UMR-83E (0.38 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the ink smear when used with highlighters?\u003c\/strong\u003e\u003cbr\u003e\nThe Uni-ball Signo UMN-155 uses specialized pigment ink that cures rapidly into paper fibers. Once fully dry, it provides superior water and smudge resistance compared to standard dye-based gel inks, making it highly compatible with fluorescent and pastel highlighters.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I replace the ink cartridge once it runs out?\u003c\/strong\u003e\u003cbr\u003e\nYes, the UMN-155 is fully refillable. It accepts authentic Uni UMR-85N (0.5 mm) and UMR-83E (0.38 mm) gel ink refills, allowing you to swap colors or line widths while keeping the durable pen body.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this pen suitable for left-handed writers?\u003c\/strong\u003e\u003cbr\u003e\nYes. The low-viscosity pigment ink sets quickly on standard paper, significantly reducing hand smudging for left-handed note-takers and journaling enthusiasts.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow are orders and customer service inquiries supported?\u003c\/strong\u003e\u003cbr\u003e\nFor any order inquiries after purchase, you can contact our dedicated support team at szjyf@outlook.com. Full refunds are available at any time prior to order shipment confirmation.\u003c\/p\u003e","brand":"Uni-ball","offers":[{"title":"Black（3PCS）","offer_id":69502328504354,"sku":"UNI-GEL-UMN155","price":12.0,"currency_code":"USD","in_stock":true},{"title":"Blue（1+3PCS）","offer_id":69502328537122,"sku":"UNI-GEL-UMN156","price":12.0,"currency_code":"USD","in_stock":true},{"title":"Red（1+3PCS）","offer_id":69502328569890,"sku":"UNI-GEL-UMN157","price":12.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0902\/3045\/6354\/files\/uni-signo-umn155-gel-pen-black.jpg?v=1793176851","url":"https:\/\/www.xypen.com\/products\/uni-signo-umn-155-retractable-gel-pen","provider":"XYPen","version":"1.0","type":"link"}