Uni-ball Micro Deluxe Rollerball Pen, 0.5 mm, Waterproof Pigment, Smooth Uni-Flow, Metal Clip, Ideal for Everyday Writing - Black

Key specs: 0.5 mm fine line, pigment-based ink, Uni-Flow regulated ink delivery, quick-dry pigment to reduce smearing, classic balanced barrel, and a metal clip.

Pigment ink sits on the surface of the paper and dries quickly, providing water resistance and smudge resistance. This helps keep printed forms and notes legible and reduces feathering on many papers.

Uni-Flow ensures a steady, controlled ink delivery across long writing sessions, producing consistent lines with fewer skips or variations in line width.

It's well-suited for filling out forms, signing documents, daily note-taking, planners, and journaling where crisp 0.5 mm lines are preferred.

Write with a steady, moderate pace and allow a moment for the line to dry, especially on glossy or coated papers. Keep the cap on when not in use to protect the nib and ink flow.

This model is designed to work with compatible refills where available. Availability and compatibility can vary by region, so look for UB155-compatible cartridges or refills in your market.

Yes. The pigment ink is designed for general writing tasks and is commonly considered non-toxic and suitable for classroom and workplace use.

Compared with standard ballpoints, this rollerball with pigment ink provides smoother strokes and water resistance. Compared with gel pens, it often dries faster with less smearing. For exact side-by-side comparisons, you can look at the specific 0.5 mm options listed on Fepy and compare ink types, drying times, and line quality.

You get a trusted Uni-ball writing experience with a durable metal clip, consistent 0.5 mm lines, and pigment ink that resists smearing and water exposure—features that support reliable daily writing and professional-looking results.

Standard writing papers, notebooks, and office papers typically perform well. Pigment ink tends to perform reliably on uncoated papers; very glossy or coated surfaces may require longer drying times and can affect line behavior.

Keep the cap on when not in use, store at room temperature away from extreme heat, and avoid pressing or flexing the nib. If the ink dries on the nib, gently recap and allow time for the ink to reflow before writing again.