Uni-ball One 3 Review: Is This 3-Color Gel Pen Worth It?

The Uni-ball One 3 Multi Pen 0.5mm combines black, red, and blue gel ink in one compact Japanese pen. Instead of carrying three separate pens, you can switch colors by rotating the body.

Its compact design and smooth Uni-ball One ink make it especially useful for students, planners, note-taking, and everyday carry.

What Makes the Uni-ball One 3 Different?

The biggest advantage is having three gel ink colors in one pen:

• Black

• Red

• Blue

A twist mechanism lets you quickly switch between colors, making it convenient for color-coded notes, studying, planners, and work.

How Does It Write?

Each color uses a 0.5mm tip, giving you clean, controlled lines that work well for smaller handwriting and detailed notes.

Uni-ball One gel ink produces bold, easy-to-read writing while maintaining the smooth feel expected from a gel pen.

The compact barrel also makes the pen easy to carry in a pencil case or pocket.

Who Is It Best For?

The Uni-ball One 3 is a strong choice for:

• Students

• Color-coded note-taking

• Planners and journals

• Office work

• Everyday carry

• Anyone who wants fewer pens in their pencil case

Is the Uni-ball One 3 Worth It?

If you regularly use black, red, and blue ink, the Uni-ball One 3 is a convenient alternative to carrying three separate gel pens.

Its combination of compact size, smooth 0.5mm writing, and easy color switching makes it especially practical for school, planning, and everyday notes.

Interested in trying one? Explore the Uni-ball One 3 Multi Pen 0.5mm at Marukaku.