Uni Jetstream 4&1 Bamboo: A Calm, Tactile Take on the Classic Multi-Pen

Introduction

Uni’s Jetstream 4&1 has long been one of the easiest multi-pens to recommend, and the new Jetstream 4&1 Bamboo builds on that familiar formula with a warmer, calmer character. Priced at 2,200 yen (tax included), it launched alongside the Uni-ball OneP and carries the concept of “writing tools for a lighter everyday life.” The body shape and functions stay true to the standard Jetstream multi-pen, but the bamboo grip gives it a look and feel all its own.

Design and Materials

The Bamboo version comes in three colors: beige, sage, and blue-grey. Each is soft and pleasant, and the overall effect is genuinely soothing rather than flashy. The barrel carries no printed markings at all, and the sticker on the back peels off cleanly, so you can keep it looking minimal with no effort.

The key difference from past editions is the grip, which uses bamboo. You can enjoy the vertical fiber texture typical of bamboo, and the surface feels very pleasant in hand. A clear coating is applied to help the bamboo hold up to long-term use, so it is not left entirely raw. The clip and nose cone are finished in pearl bright plating with a subdued gloss, which unifies the colors across the whole pen beautifully. If you prefer glossy metal furniture for a more premium feel, this may read as understated, but the restrained finish genuinely suits these pale barrel colors. Similar subdued-tone releases, such as the Pure Malt Jetstream Inside 4&1 with its whisky barrel grip, show how much the non-barrel colors can change the overall impression; here the grip ties everything together nicely.

Refills, Knock Action, and the Pencil

The Jetstream 4&1 Bamboo is a slide-knock multi-pen. Sliding the colored lever extends and retracts the refills, and the mechanism includes a 0.5mm black, red, blue, and green ballpoint plus a mechanical pencil. The knock action feels light and crisp, and switching between refills is smooth. Within the multi-pen category, it is fairly easy to knock compared to most.

The supplied refills are SXR80, Uni’s standard low-viscosity ballpoint refill. One important note: when refilling the mechanical pencil, load no more than three sticks of lead at a time, as overfilling can cause malfunction. The eraser is hidden under a cap that pulls straight up and off.

Specs and Balance

The pen measures 148mm in total length, weighs 23.5g, and has a 13mm barrel diameter. The balance point sits low, which gives it a stable, planted feel during writing. That balance, combined with the textured bamboo grip, means it does not slip even when writing quickly.

Writing Performance

On paper, the Jetstream experience holds up. The 0.5mm ballpoint tip feels firm and secure rather than glassy-smooth, but it never skips, which gives it a real sense of confidence while writing. Some tip wobble is present, as it is with most multi-pens, but it is well within acceptable range given the mechanism.

Things to Consider Before Buying

A few quirks are worth knowing before you buy. The clip can dig into your hand while writing, which becomes a mild annoyance over longer sessions. At 13mm, the barrel is genuinely thick, so if you dislike fat pens, this one may not suit you. Finally, the slide mechanism occasionally catches when switching from the pencil back to a ballpoint refill. A quick rattle of the lever frees it immediately, but it is a small flaw nonetheless.

Buying Advice

If you want a multi-pen that feels calm, looks lovely, and writes reliably, the Jetstream 4&1 Bamboo is an easy pick, especially in beige or sage. If you write with a tight grip, find the clip position uncomfortable, or prefer slimmer barrels, it is worth testing the 13mm diameter first. Fans of the standard Jetstream 4&1 who want something more tactile will find the bamboo grip a meaningful upgrade in daily enjoyment.

Conclusion

The Uni Jetstream 4&1 Bamboo takes a proven multi-pen and gives it a soft palette, a pleasant bamboo grip, and low, stable balance. Its occasional knock catch and prominent clip are minor complaints in an otherwise comfortable, good-looking everyday writer. If the pale colors and wood texture appeal to you, it deserves a closer look.