uni-ball one F 0.38 Hinata Summer

Embrace the soft warmth of a summer afternoon with the uni-ball one F 0.38 Hinata Summer (日向夏 - Hyūganatsu). Part of the beautifully curated Faded Color series, this edition takes inspiration from the vibrant yet gentle landscapes of a sun-drenched Japanese summer. The body is finished in an elegant, dusty pastel yellow that captures the essence of a "sunny summer" day, offering a comforting fashion statement for your desk setup.

The uni-ball one F represents an ergonomic evolution from the standard model. It replaces the traditional rubber grip with a sleek, continuous matte body and introduces a stabilizer mechanism. Armed with a solid metal nose cone and forward weight distribution, this pen is engineered to keep your writing fluid, stable, and completely fatigue-free.

Key Features

• Poetic Japanese "Hinata Summer" Finish: Styled in a muted, faded sunny-yellow barrel inspired by natural summer landscapes, giving the pen an artistic, premium executive look.
• Low Center of Gravity (Stabilizer Mechanism): Equipped with a solid metal nose cone that shifts the pen's weight forward. This "value-added" balance allows you to write with a lighter touch, drastically reducing hand strain during long study or journal sessions.
• Precision 0.38mm Black Ink: Despite the colored barrel, the pen comes standard with ultra-crisp black ink. The 0.38mm tip ensures precise, wiggle-free lines inside tightly formatted planners or grid journals.
• Guinness Record-Breaking BEADS-PACK Ink: Formulated with innovative pigment tech where the ink stays cleanly on top of the paper fibers rather than sinking in, yielding a deeper, more high-contrast black line.
• Rapid-Drying Performance: The fast-absorbing liquid carrier ensures the ink dries nearly instantly on the page, keeping your writing sharp, professional, and entirely smudge-free.
• Oversized Open Wire Clip: Features uni-ball's iconic spring-loaded metal wire clip that opens wide like a clamp, letting you secure the pen safely to thick cardboard folders or book covers.

Specifications at a Glance

• Barrel Color: Hinata Summer (Faded Sunny Yellow / 日向夏)
• Ink Color: Carbon Black
• Tip Size: 0.38 mm (Ultra-Fine Precision)
• Model Code: UMN-SF-38 (Hinata Summer Variant)
• Weight: 14.3 g (Perfectly balanced forward weight)
• Dimensions: 11.1 mm × 139.2 mm
• Refill Type: Fully refillable with standard UMR-38S / UMR-05S gel cartridges.