Uni-ball ZENTO Gel Pen 0.5 Jade

The uni-ball ZENTO Flow Model in Jade is a Japanese rollerball pen with water-based pigment ink and a long aluminum grip. The barrel and anodized metal grip feature the same muted jade coloring, with the grip feeling cool and smooth to the touch. At its core is the specially developed ZENTO ink, which features an incorporated surfactant (POA) that significantly reduces writing friction while producing clean, precise lines.

Key Features

• ZENTO Ink with Cushion Effect: A POA surfactant acts as a buffer between the ball and paper, reducing writing friction by approximately 40% compared to previous uni products according to the manufacturer. The stroke flows smoothly and evenly, even across many pages.
• Attraction Particles: Special particles pull the ink together and reduce feathering and show-through on the back of the paper.
• Pigment-based black ink: Water-based and quick-drying.
• Two-tone Design in Jade: Barrel, grip, and clip appear in coordinated tones. The anodized aluminum grip gives the pen a pleasantly solid feel in hand.
• Movable Clip: The color-matched clip secures the pen safely to your notebook or planner.
• Click Mechanism: The 0.5 mm tip retracts and extends with the push of a button—no cap needed.
• Refillable: The compatible ZENTO refill is UBR-Z-05 (0.5 mm).

Application & Tips

• Journaling and Bullet Journaling: The 0.5 mm tip produces a clearly defined line, ideal for handwriting, headings, small drawings, and frames in planners.
• Tomoe River Paper: Tomoe River 52 g and 68 g work very well. The low show-through tendency of ZENTO ink keeps the back side clean, and the smooth surface allows the ball to glide particularly easily.
• Smooth, Calendered Paper: On ink-resistant, closed papers, ZENTO ink reaches its full potential. On highly absorbent or rough paper, the line may appear slightly wider.
• Study and Note-Taking: Since minimal pressure is required, the pen is gentle on wrists and fingers, even after a long lecture.
• With Highlighters: Water-based highlighters can dissolve the ink. Allow the ink to dry thoroughly and test your highlighters on an inconspicuous area first.
• Handling: The aluminum grip is smooth. Those who write with warm or moist hands should grip slightly higher.

Technical Specifications