Mitsubishi Uni-ball Eye UB-157 Bolígrafo roller 0,4mm Azul

The Mitsubishi Uni-ball Eye UB-157 rollerball pen sets itself apart with its precision 0.4 mm line width and advanced Uni Super Ink technology, delivering a smooth, consistent writing experience that resists water, fading, and tampering. Unlike standard rollerballs, this pen combines a fine stainless steel tip with quick-drying liquid ink, making it ideal for detailed work, note-taking, and document signing.

Highlights

• Fine 0.4 mm line width for precise writing
• Uni Super Ink: water-resistant, fade-resistant, and tamper-proof
• Quick-drying liquid ink prevents smudging
• Visible ink supply window for monitoring ink level
• Stainless steel rollerball tip for durability and smoothness

In daily use

Whether you're annotating documents, journaling, or sketching fine details, the UB-157 delivers crisp, clean lines with minimal pressure. The capped design protects the tip when not in use, and the plastic barrel with a convenient clip makes it easy to carry in a pocket or notebook. Please note that this pen is not refillable, so it is intended for single-use until the ink runs out.

Full specifications

• Pen type: Rollerball Pen
• Ink colour: Blue
• Line width: 0.4 mm
• Nib size (ball diameter): 0.7 mm
• Ink type: Liquid Ink
• Ink technology: Uni Super Ink
• Ink properties: Water-resistant, fade-resistant, tamper-proof
• Tip material: Stainless Steel
• Tip type: Rollerball
• Barrel material: Plastic
• Cap type: Capped
• Visible ink supply: Yes (Ink window)
• Refillable: No
• Grip type: Standard
• Clip material: Plastic
• Product series: Uni-ball Eye
• Model name: UB-157
• Quick-drying ink: Yes
• Quantity: 1 Pen

Final note

A reliable everyday rollerball that combines fine precision with durable, tamper-resistant ink—perfect for those who demand clarity and security in their writing.