uni uni-ball One Multi Pen Gel Ink Refill - 0.38mm (3 colors)

Uni Mitsubishi uni-ball one 3 Multi Gel Pen Refill (UMR-ML Series) 🖊️✨

Never let your favorite twist-select multi-pen run dry! Keep your daily writing smooth, dark, and vibrant with the official Uni-ball One 3 Multi Gel Pen Refills (UMR-ML).

Specifically engineered for the rotational uni-ball one 3 series, these premium gel ink cartridges deliver the exact same high-contrast, deep ink formulation that made the original single-color pens a global sensation among paper lovers and journalers.

🔬 The Magic of "Beads-Pack" Ink Technology

What makes uni-ball one ink so different from standard gel pens? It comes down to science. Traditional inks sink deep into paper fibers, which can dull the color and cause bleed-through. Uni's proprietary Beads-Pack Pigment Ink uses specialized micro-particles that encapsulate the colorant. The liquid base is quickly absorbed by the paper for rapid drying, while the rich pigments stay locked tightly to the surface.

The result?

• Deepest Blacks & Purest Colors: Text that stands out with unmistakable, matte clarity.

• Smudge-Resistant & Quick-Drying: A dream for left-handed writers and fast note-takers.

• Perfect for Layering: Zero bleed-through means your planner pages stay pristine, even when writing on delicate or thin paper inserts.

🎨 Custom Tailor Your Writing Experience

These refills are entirely interchangeable within any uni-ball one 3 pen body. Whether you want to swap a 0.5mm pen over to ultra-fine 0.38mm lines, or create a custom palette of your most-used colors, just choose your preferred tip size and shade from the dropdown menu!

⚙️ Technical Specs & Compatibility

• Brand: Uni Mitsubishi Pencil (Made in Japan)

• Model Code: UMR-ML-38S (0.38mm) / UMR-ML-05S (0.5mm)

• Ink Type: Pigment-Based Water Gel Ink

• Quantity: 1 individual refill per pack

• Tip Sizes Available: 

  • 0.38mm (Extra-Fine): Perfect for small planner grids and high-density text tracking.

  • 0.5mm (Medium): Ideal for bold, smooth, everyday brainstorming and creative journaling.

• Available Colors: Black, Red, Blue

• Compatibility:

  • Fits perfectly inside all Uni-ball One 3 models (including standard and Gift Versions).

  • Universally compatible with Uni-ball Style Fit multi-pen component systems.