Zento Uni-ball Black Ink Gel Pen UMN-SF

Uni-ball One F (UMN-SF) - Premium Low Center-of-Gravity Gel Pen

Refined Writing. Unmatched Stability.

The Uni-ball One F is an elevated evolution of the award-winning Uni-ball One series. Designed for those who seek a professional writing experience, the "F" stands for Feel—emphasizing a design that fits naturally in your hand and provides a grounded, stable writing sensation.

Key Features

• Integrated Metal Tip (Stabilizer): Unlike standard plastic pens, the One F features a precision-engineered metal nose cone. This shifts the weight toward the tip, creating a low center of gravity that reduces hand fatigue and allows for smooth, controlled strokes with minimal pressure.
• Revolutionary "One Ink" Technology: Experience the darkest black and most vivid colors in the industry. The pigment-based ink is formulated to sit on top of the paper fibers, resulting in crisp, high-contrast lines that are smudge-proof and water-resistant.
• Sophisticated Aesthetic: The seamless, minimalist barrel is finished in a range of "faded" muted tones inspired by nature. Its sleek matte texture and signature functional metal wire clip make it a statement piece for any desk.
• Fast-Drying Performance: Ideal for left-handed writers and fast-paced note-taking. The ink sets instantly, keeping your pages clean and professional.

Best For

• Heavy Note-Taking: The weighted balance is perfect for students and professionals during long writing sessions.
• Bullet Journaling & Scrapbooking: Pairs perfectly with 160gsm premium paper, ensuring your artistic layouts are sharp and vibrant without bleeding through.
• Modern Calligraphy: The 0.38mm and 0.5mm tips offer extreme precision for fine detailing and headers.

Technical Specifications