Mitsubishi Pencil UNI-BALL ONEF Un ballpot One oil-based ballpoint pens eraser (F black) Ball diameter 0.38mm

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The color represents charcoal extinguished on a quiet night. The clip is also painted matte black, and the entire barrel represents the black of faded charcoal.

Mitsubishi Pencil's ballpoint pen "uni-ball oneF" uses faded colors for the barrel
A gel ink ballpoint pen with a themed barrel color and a low center of gravity for a stable writing experience.
"uni-ball one F" is a new series from "uni-ball one". The barrel design has a smooth finish with no steps. The barrel comes in a range of faded colors that look dull and faded. Equipped with a stabilizer mechanism, the low center of gravity provides a stable writing experience.
There are seven barrel color variations, with the 0.38mm ball diameter offering "Keshi-tan (F Black)", "Muku (F Gray)", "Hana-kasumi (F Pink)", and "Hyuga-natsu (F Yellow)", and the 0.5mm ball diameter offering "Shimo-bashira (F Blue)", "Ha-shizuku (F Green)", and "Akanesora (F Red)".
The ink used in "uni-ball one F" is the newly developed "Uni-ball One Ink", which makes the black color appear even darker. You can write letters that will leave an impression when you look back at your notebook.

[Product Features of uni-ball one F] ■Barrel colors that express familiar colors that you see in your daily life The scenery you see in your daily life changes depending on the season and situation, and appears to be ambiguous colors rather than primary colors. Based on this, we have prepared a range of barrel colors that look dull and faded (faded) colors. With the desire to have a favorite pen that is always at hand, the names of each barrel color were chosen from trivial everyday scenes that would allow the user to empathize with the emotional sensibility.

■Simple and more sophisticated barrel design
- The barrel material is unified between the rear barrel and the front barrel, creating a smooth design with as few steps (unevenness) as possible.
- By lengthening the front barrel, the streamlined shape to the tip becomes smoother, giving an overall clean impression.

■Equipped with a "stabilizer mechanism" that realizes stable writing with a low center of gravity
- The front barrel that holds the refill uses a metal pen tip with improved dimensional accuracy, achieving a stable and smooth writing feel with a low center of gravity. Since it can be written steadily and smoothly with light force, it is suitable not only for studying and taking notes, but also for diary writing.
- Not only is it comfortable to write with, but the metal pen tip accentuates the sharpness of the design, giving it a more sophisticated and high-quality impression.

"uni-ball one F" Metallic nib
nib.jpg
A metal part is built into the nib. The orange part in the image above (cross-section of nib) is where the metal part is used.

"uni-ball one" conventional resin nib

[Reference] About "uni-ball one"
"Uni-ball one" was newly released in February 2020 and is known for its "clear, crisp writing" function and its "simple design that blends into your living space". It has been well received by a wide range of people, from students to working adults.

■Features of the newly developed "Uni-ball One Ink"
Unlike general gel inks, the ink of "uni-ball one" uses a new pigment that minimizes the penetration of the coloring material into the paper fibers.
The pigment used in "Uni-ball One Ink" is a proprietary bead-pack pigment that confines conventional coloring materials inside particles.
By confining the pigment that becomes the coloring material of the ink inside the particles and increasing the particle size, the penetration of the coloring material into the paper surface is minimized. As a result, the coloring material on the paper surface develops its original color, the black is darker, and the colors are more vivid.

① The black is darker and the colors are more vivid, allowing you to write clear letters that are easy to remember
Compared to general gel ink, the black is darker.
In a joint study between our company and Ritsumeikan University, we found that the darker and clearer the black color, the easier it is to remember. By using 'uni-ball one', which is darker than regular gel ink, you can write characters that are more likely to be remembered when you look back at your notes.

Comparison of darkness between conventional products and 'uni-ball one'

Example of notes written with 'uni-ball one' (top row) and conventional product (bottom row)


Under the supervision of Professor Masashi Hattori of the Department of Integrated Psychology at Ritsumeikan University, a memory recall task, an experimental method of cognitive psychology, was conducted on high school students. When comparing the memory performance of handwritten characters using ballpoint pens of different shades, the results showed that characters written with the dark black ink of 'uni-ball one' had a higher correct answer rate and a higher recall rate than those written with regular gel ink. The results of this research were reported at the 38th Annual Meeting of the Japanese Society of Basic Psychology.

② Ink that does not bleed and dries quickly
General quick-drying ink achieves quick drying by quickly penetrating the ink into the paper. As a result, the ink can bleed or bleed through.
The newly developed "Uni-ball One Ink" changes the solid and liquid component ratio in the ink, allowing the liquid component to quickly penetrate the paper while leaving the solid coloring material on the paper. Although it is a quick-drying ink that penetrates the paper quickly, it does not bleed or bleed through because it prevents the coloring material from being absorbed into the paper.

■ Simple and straight barrel design
The barrel design is simple and straight. The oval-shaped "open wire clip" is not only stylish in design, but also functional, as it is a movable clip that is easy to clip onto a notebook or diary.