Uni-ball Signo UMR-85N Gel Pen Refill 10-Pack

More Ink, Less Interruption.

Introducing the Uni-ball Signo UMR-85N Gel Pen Refill, the authentic Japan Mitsubishi replacement for the iconic uni-ball Signo retractable gel pen series. Engineered as the large-capacity successor to the UMR-83, it delivers significantly more ink per refill, allowing for extended writing sessions without interruption.

Featuring a 0.5mm ball diameter, this refill lays down a precise, clean line ideal for exams and study notes. Compatible with standard Signo retractable bodies like the UMN-155-05, UMN-105, and UMN-152, this 10-pack box ensures you always have a spare ready when you need it.

✦ Key Features

• Large-capacity design — holds significantly more gel ink than the UMR-83
• 0.5mm tip size — produces precise, clean lines for detailed writing
• Universal Signo compatibility — fits UMN-155-05, UMN-105, and UMN-152
• Smooth, water-resistant ink — consistent flow with no blobbing or skipping
• 10-pack box value — ensures you never run dry at a critical moment

✦ Specifications

• Tip Size: 0.5mm
• Ink Colors: Black, Blue-Black, Blue, Red
• Set Quantity: 10 refills
• Compatible Pens: Uni-ball Signo (Retractable series)
• Brand: Uni-ball (Mitsubishi Pencil)

Frequently Asked Questions

Q: Which pens do these refills fit?

A: The UMR-85N is the standard replacement refill for Mitsubishi Pencil's Signo retractable gel pen range, specifically designed to fit the UMN-155-05 (Signo RT1), UMN-105 (Signo RT), and UMN-152 (Signo 307).

Q: Does the ink smear easily?

A: No. Uni-ball uses a premium gel ink formula that flows smoothly and becomes highly water-resistant once dry, significantly reducing smudging.

Q: What is the difference between the UMR-85N and the UMR-83?

A: The UMR-85N is the large-capacity version of the UMR-83. Its longer body holds considerably more ink, giving you more writing time and extending the life of each refill.