Uni-ball One Signature 3 Color Retractable Ballpoint Pen (Silver) Review

Introduction

Uni’s Signature line has been one of the most talked-about stationery releases of 2026, and the three-color version keeps that momentum going. The Uni-ball One Signature 3 Color Retractable Ballpoint Pen, released on February 25, 2026 at 5,500 yen, takes the well-loved single-color Signature design and adds three inks, a magnetic cap, and a genuinely unusual rotating extension mechanism.

Availability has been a real issue. Online pre-orders sold out quickly, and Standard and Flow models have been hard to find as well. Stock has been relatively easy to get in big cities, but much harder in rural areas, and resale prices on secondhand apps have climbed. The good news: this is not a limited edition, and supply is expected to stabilize over time, so there is no reason to pay inflated reseller prices.

Who This Pen Is For

This pen makes sense for anyone who wants a premium multi-color pen that does not look or feel like a typical multi-color pen. If you prefer three-color ballpoint pens over multi-tools that cram in a mechanical pencil, this is squarely aimed at you. It is also a strong pick for notebook writers who value a refined writing feel and understated design over flashy features.

It is less compelling if you mainly want a cheap daily beater. At 5,500 yen, this is a considered purchase, though the price is reasonable given the complex structure, varied materials, and machining involved.

Packaging and First Impressions

Uni’s recent packaging design leans casual, with fluorescent accent colors and a stylish, unified look that is instantly recognizable as a Uni product even before opening the box. A large number 3 printed on the packaging makes it obvious at a glance that this is a three-color pen rather than a single-color model.

The Signature model comes in two colors: M Black and Silver. M Black turned out to be a deeper black than the metallic black of the single-color pens, so it may stand for Midnight or Matte rather than Metallic. Interestingly, the black version uses a 0.5 mm refill while the silver version ships with a 0.38 mm refill. The refill design is shared, so a 0.38 mm refill can be fitted into the black pen as well. There is no 0.7 mm option in this launch.

Design and Build Quality

The most impressive thing about the three-color Signature is its silhouette. Despite packing three refills, it looks almost identical in profile to the single-color Signature, just slightly larger overall. The metal cap, resin-surfaced grip and lower shaft with metal interiors, and matte finishing all carry over the premium feel of the original.

Detailing is careful throughout. The parting line on the resin parts, normally a visible seam, has been finished so that it is imperceptible to the touch with no steps. The knurled center section provides a secure grip that stays comfortable even under a firm hold. The color markings are printed subtly so they do not detract from the overall design, which creates a sense of luxury fitting for the top-of-the-line model. The one long-term concern is that printed markings will inevitably wear off with extended use.

The Rotating Extension Mechanism

This is where the pen gets genuinely interesting. As a rotating extension type, you can twist the lower shaft with one hand to extend or retract the tip. Unusually for a multi-color pen, the mechanism works even with the cap removed or posted, thanks to a hexagonal shaft that locks into a matching shape inside the cap. That allows the cap to rotate horizontally without coming off while you extend the nib, a mechanism not seen before in a cap-type rotating pen.

The rotation has a slightly crunchy feel that is not especially smooth, but it is remarkably quiet, quiet enough to use during meetings without anyone noticing. A small mark on the knurled section aligns with the printed color notation to select the ink you want. Unlike most twist multi-color pens that lock when extended, this one stays unlocked, which fits the cap-type design.

Refill replacement is also handled well. Instead of pulling out the lower shaft, you twist off the grip section, and the screw threads are machined like the single-color Signature so they will not loosen over long use. When posted, the cap extends the pen to 135 mm, 7 mm longer than capped, giving it good balance.

Writing Performance

The silver model carries the next-generation ink in black, red, and blue. This ink uses a surfactant as a cushioning ingredient to give it elasticity, delivering strong color development and a controlled, confident writing feel rather than an overly slick glide. The newly developed thin refills were designed specifically for multi-color pens, and one of their appeals is cross-compatibility: they can also be used in other compatible multi-color models, letting you swap inks across pens in either direction.

On paper, the 0.38 mm refill writes very well. Because multi-color pens angle the refill rather than feeding it straight out, the nib wobbles slightly, but it has almost no effect on the writing feel. In a notebook it is easy to control without being too slippery, producing clean lines, and the scratchy feeling sometimes associated with this ink type is nearly absent. For anyone who writes small characters regularly, the 0.38 mm is the better choice; the ink is already smudge-resistant, so 0.5 mm is fine too.

Buying Advice

If you want this pen, buy it at retail and wait for stock to normalize. It sold out fast after pre-orders opened and resale prices have risen, but it is a standard product with stable supply expected, just like the single-color Signature models. Paying reseller prices is not worth it.

Choose the silver version if you want the 0.38 mm refill and a cooler, more understated look; the black version is the pick if you prefer 0.5 mm out of the box, and the refills are swappable anyway.

Conclusion

The Uni-ball One Signature 3 Color Retractable Ballpoint Pen is a very well-made pen that keeps everything that made the single-color Signature great and adds a genuinely new cap-type rotating mechanism on top. The build quality is excellent, the writing feel is comfortable, and getting the next-generation ink into a multi-color pen this early is a real advantage. The printed color markings will wear over time, and the price is on the higher side for a multi-color pen, but the craftsmanship and design justify it. Be patient, skip the resellers, and this one is well worth picking up.