Uni Uniball One 3 Multi-Function 3-Color Gel Ink Pen 0.38mm/0.5mm

Three colors. One pen. Zero compromise. The Uni Uniball One 3 is a premium Japanese multi-function gel ink pen that puts black, red, and blue ink at your fingertips — switchable with a single click. Engineered by Mitsubishi Pencil Co., it combines the legendary Uniball One ink formula with a sleek, compact rotating body built for everyday precision.

Why the Uniball One 3 Stands Apart

The Uniball One series is celebrated for its high-concentration pigment ink that delivers exceptionally dark, vivid lines — even on glossy or coated paper. The "One 3" takes that ink and packages it into a 3-color modular system, so you can color-code notes, annotate documents, and sign with style — all without switching pens.

Key Features

• 3-in-1 multi-color system — Black, Red, and Blue gel ink in a single pen body
• 0.38mm ultra-fine tip — crisp, precise lines ideal for dense note-taking, kanji, and detailed writing
• Retractable twist mechanism — rotate the barrel to select your color; no caps to lose
• Uniball One high-density ink — rich, saturated pigment that resists feathering and bleed-through
• Modular refill design — individual color modules are replaceable, reducing waste
• Compact, pocket-friendly body — slim profile fits comfortably in any pen case, pocket, or planner loop
• Made in Japan — Mitsubishi Pencil Co. quality, trusted by students and professionals worldwide

Perfect For

• Students who color-code lecture notes and study guides
• Professionals annotating reports, contracts, and planners
• Bullet journalers and planner enthusiasts who need multiple colors on hand
• Anyone who appreciates the precision of Japanese stationery engineering

Ink Colors Included

Each pen comes loaded with three Uniball One gel ink modules:

• ⚫ Black — deep, authoritative, perfect for primary writing
• 🔴 Red — vivid and bold, ideal for corrections and emphasis
• 🔵 Blue — classic and professional, great for signatures and annotations

Specifications

• Brand: Uni (Mitsubishi Pencil Co., Japan)
• Model: Uniball One 3
• Tip Size: 0.38mm/0.5mm
• Ink Type: Gel (high-concentration pigment)
• Colors: Black / Red / Blue
• Mechanism: Retractable twist-select
• Refillable: Yes (modular ink cartridges)
• Origin: Japan

Upgrade your everyday carry. One pen, three colors, infinite possibilities — the Uni Uniball One 3 is the last multi-pen you'll ever need.