Gel-ink Pen - 0.5mm - uni-ball ONE F

The uni-ball ONE F from Mitsubishi Pencil, in three muted barrel colours, each named after a small everyday scene. F in "ONE F" stands for feel.

All three 0.5mm pens write in black. The ink is the uni-ball ONE's pigment gel ink, made with a bead-pack pigment held inside fine particles so that it stays on the surface of the paper rather than soaking into the fibres, which gives a deeper black.

Compared with the standard uni-ball ONE, the F has a metal tip section made to closer tolerances, a stabiliser mechanism that lowers the centre of gravity for a steadier line, and a barrel of one material from front to back, with almost no step between the parts.

Mitsubishi Pencil took the colour names from small, ordinary moments. At 0.5mm the colours are:

• green - hashizuku (葉雫), raindrops falling from green leaves;
• blue - shimobashira (霜柱), frost columns by the roadside on a cold morning; and
• red - akanesora (茜空), the sky at dusk on the way home.

Specifications:

• Nib: 0.5 mm: Faded Blue, Faded Green, Faded Red.
• Ink: black pigment gel ink
• Size: 139.2 mm long, 11.1 mm diameter, approx. 14 g
• Refill: UMR-05S (0.5 mm)
• Model: UMN-SF-05
• Origin: Made in Japan

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MITSUBISHI PENCIL CO., LTD. is a Tokyo-based writing instruments company with no connection to the Mitsubishi industrial conglomerate. Mitsubishi Pencil registered its three-diamond trademark in 1903, ten years before the Mitsubishi industrial group registered theirs. The three diamonds is a family crest.

The company was founded in 1887 by Niroku Masaki, inspired by Western pencils he first encountered at the 1878 Paris World Fair. It began as the Masaki Pencil Manufacturing Company in Shinjuku, Tokyo, and was renamed Mitsubishi Pencil Co., Ltd. in 1952. In 1958 it launched the uni pencil - named for "unique" and the French word for "smooth," with a logotype designed to be "a house that warmly wraps people up."

The uni brand became the company's corporate identity and today appears on the full range of its products. Mitsubishi Pencil launched Japan's first ballpoint pen in 1959, and has continued to set ballpoint benchmarks ever since - among them the Jetstream ink system, which became one of the world's best-selling ballpoint formulations, and the Jetstream Edge, which pushed the technology to its present limit. In 2024 the company acquired the German writing instrument brand Lamy, extending a global presence that now spans over 100 countries.