Uni-Ball Zento Standard — Sienna

Ultra-smooth ballpoint gel pen with intense black ink that flows like a dream!

This pen is part of the 2026 limited edition Japan colors release, which have pens in lovely marble and stone-speckled finishes.

The nib sizes of the Zento series are interchangeable — you can swap a 0.38, 0.5 or 0.7 refill into any pen, and vice versa.