Uni-ball Signo UMR-85N Gel Refill 0.5mm Box of 10 Japan

Uni-ball Signo UMR-85N Gel Ink Refill — 0.5mm, Box of 10, Japan

The official replacement refill for Uni-ball Signo RT retractable gel pens — UMN-105, UMN-155-05, UMN-152, and compatible bodies. Ten refills per box, three ink colours, one quality standard.

• Official Signo RT Replacement — Fits UMN-105, UMN-155-05 & UMN-152: The UMR-85N is the official replacement refill for Uni-ball Signo RT retractable gel pens — a direct fit that restores each pen to its original writing performance without modification or adapter. If your Signo RT pen accepts a click-type (knock-style) refill, the UMR-85N is the correct replacement.
• Gel Ink — 0.5mm, Waterproof & Fade-Resistant: Uni-ball’s gel ink formula delivers a smooth, consistent 0.5mm line that is waterproof once dry and fade-resistant over time — ink that holds through highlighter passes, damp conditions, and long-term archiving without feathering or bleeding on standard paper weights.
• Skip-Free Flow — Consistent from First Use to Last Drop: Engineered for uninterrupted ink flow throughout the full refill cycle — no dry-out between sessions, no pressure variation, no inconsistency as the ink level drops. The same performance standard as the original factory refill, maintained through every replacement cycle.
• Box of 10 — Classroom, Office & Exam Ready: Ten refills per box — the standard supply unit for students, teachers, and office users who write daily. Each refill is individually packaged in a retail sleeve with full specification details including model number, ball size, and ink colour. Stock the drawer before the first one runs out.
• Three Ink Colours — Made in Japan: Available in Black (24 pcs/box), Blue (33 pcs/box), and Red (15 pcs/box) — manufactured in Japan by Mitsubishi Pencil Co. to Uni-ball’s precision quality standard. Made in Japan.

Frequently Asked Questions

Which Uni-ball pens does the UMR-85N fit?
The UMR-85N is compatible with Uni-ball Signo RT UMN-105, UMN-155-05, UMN-152, and other Signo RT click-type (knock-style) pen bodies. Check your pen’s packaging or barrel for the compatible refill model.

Is the UMR-85N the same as the UMR-85?
The UMR-85N is the updated version of the UMR-85, designed specifically for knock-style (click retractable) Signo RT pens. Always check your pen model to confirm compatibility before purchasing.

How many refills are in a box?
Each box contains 10 individually packaged refills in your chosen ink colour — Black, Blue, or Red.

Is this refill waterproof?
Yes. Uni-ball’s gel ink is waterproof once dry and fade-resistant over time — suitable for documents, journals, and any writing intended to last.

Where is this refill made?
Made in Japan by Mitsubishi Pencil Co. Each refill is manufactured to Uni-ball’s Japanese quality standard and marked accordingly on the individual retail packaging.

SKU: UNI-REFILL-UMR85N