A collection of Uni Jetstream ballpoint pens in various pastel colors alongside their original retail packaging.

[Gentei Edition] Uni Celebrates Jetstream’s Anniversary with Limited Colors and High-Capacity Refills

Shirogane

October 22, 2026

Stationery

Limited Edition

When Mitsubishi Pencil (uni) debuted the Jetstream in Japan in 2006, it permanently altered expectations for everyday writing tools in Japan. By solving the sluggish drag, blobby startups, and messy smearing long associated with conventional oil-based paste inks, Jetstream established the "low-viscosity hybrid oil" category. Over the last two decades, the formula has expanded into an expansive ecosystem, from everyday student knock-type pens to premium desk pieces like the machined, knurled .

Marking its 20th domestic anniversary, uni has unveiled the JETSTREAM 20th the selection collection. Releasing October 27, 2026, the limited run introduces four muted palette choices across the single-color Jetstream Standard and the redesigned Jetstream New 3-Color multipen, alongside an 8-pack collector’s assortment and a substantially improved high-capacity refill mechanism.

Assorted colorful gel pens and mechanical pencils arranged in a fan shape with gold number twenty balloons.

Muted Earth & Nuance Tones

The anniversary lineup departs from standard high-contrast corporate office schemes in favor of soft, natural, and dual-tone hues tailored for personal journals, canvas bags, and modern desktop organizers.

Mitsubishi Uni Jetstream ballpoint pens in various colors arranged next to their original product packaging.

For collectors and office setups, uni is offering the complete series inside a custom white collector’s box:

Jetstream Standard 0.5 mm (4 Pens): Khaki Brown, Beige Brown, Sheer White, Two-Tone Pink

Jetstream New 3-Color 0.5 mm (4 Pens): Khaki Brown, Beige Brown, Sheer White, Two-Tone Pink

Re-Engineering the Refill

Beyond aesthetic updates, the release features uni’s latest mechanical advancement: the Long-Lasting Refill (長持ちリフィル).

Because black ink accounts for an estimated 70% of multi-pen ink consumption, replacing standard multi-pen cartridges has always been an annoyance, a mild annoyance but an annoyance nonetheless. Uni tackled this by thinning the cylindrical polypropylene walls of the refill tube.

Comparison diagram showing the cross-section of a standard type and a long-lasting type ink refill tube.

By decreasing inner wall thickness while preserving identical exterior dimensions (retaining full cross-compatibility with standard SXR-80 compartments), the internal volume holds 70% more black ink by volume.

In this case, more ink equals less plastic; the ultra-thin construction cuts raw plastic usage per cartridge by roughly 30%, noticeably reducing manufacturing footprint and packaging waste.

Black multi-function retractable pen featuring blue, grey, and red ink refills.

The New 3-Color body architecture retains its specialized ergonomic feature: the high-priority black ink deploys via the top cap plunger, while red and blue select via traditional side sliders.