Q: What exactly is Uni, and how does it relate to Mitsubishi Pencil?
A: Uni is the main stationery brand of Mitsubishi Pencil, a Japanese company that’s been making writing instruments for well over a century. Under the Uni name, you get some of the most iconic pens and pencils in the world—the Jetstream ballpoint, the Signo gel pen, and the Kuru Toga mechanical pencil. They’re a brand that invests heavily in ink technology and mechanisms. At kawaiizaki, I think of Uni as the practical innovator: their stuff works brilliantly without making a big show of it.
Q: I need a pen for exams and important documents. Which Uni pen is the safest bet?
A: Go with the Jetstream for ballpoint or the Signo UM-151 for gel. The Jetstream’s oil-based ink is permanent, water-resistant, and dries immediately—great for multiple-choice sheets and signatures. The Signo UM-151 pigment ink is also waterproof and fade-resistant once dry, and it’s widely accepted for legal documents and archival use. I’d pick based on writing feel: smooth and fast with Jetstream, precise and crisp with Signo.
Q: How do I pick the right tip size in a Uni pen—0.28mm, 0.38mm, 0.5mm, 0.7mm, or 1.0mm?
A: Let your handwriting size and purpose guide you. 0.28mm and 0.38mm are extremely fine—ideal for planners, tiny grids, or anyone who writes small and precise. 0.5mm is the everyday middle ground, clean and legible. 0.7mm is for a bolder, smoother feel, great for signatures or notes you want to scan easily. 1.0mm is a marker-like line, mostly for headings or addressing envelopes. My personal sweet spot is 0.5mm for Jetstream and 0.38mm for Signo.
