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The Uni-Ball Eye Fine UB-157 dispenses liquid pigment ink through a 0.7mm stainless steel tip. This rollerball pen produces a 0.5mm line width using an internal regulator to control ink flow. The Uni-Flow system maintains constant pressure for consistent writing until the reservoir is empty.
Key Features
- Uni-Flow Pressure System: Internal regulator feeds ink consistently from the reservoir to the tip. Skips don't occur even when writing at high speeds.
- Uni Super Ink: Pigment-based formula bonds with paper fibers to resist chemical washing. Ink stays legible if the paper gets wet.
- Tungsten Carbide Ball: 0.7mm ball material resists wear and maintains a round shape. The tip won't scratch paper or leak under pressure.
- Polypropylene Barrel: High-density plastic housing includes a clear window for monitoring ink levels. You won't run out of ink unexpectedly.
- Fade-Proof Green Ink: Acid-free liquid pigment maintains color saturation over long periods. Notes remain readable despite high humidity and sunlight exposure.
Frequently Asked Questions
Is Uni-Ball Eye Fine waterproof?
The Uni Super Ink is fully waterproof once dry on the page. It uses pigment particles that bond permanently with the paper fibers.
What is the tip size of Uni-Ball UB-157?
This model uses a 0.7mm stainless steel tip. It produces a 0.5mm line width for precise writing tasks.
