WP Fine Writer Pen / KOKUYO

• Tip Type: Resin fine point with microscopic slits
• Ink Type: Water-based pigment ink
• Default Ink Color: Blue-Black
• Available Refill Ink Colors: Blue-Black, Black, Dark Green
• Refill Compatibility: KOKUYO WP Fine Writer Refill
• Barrel Diameter: φ14mm
• Length: 139mm
• Body Material: Aluminum (cap and barrel), matte blasted anodized finish
• Tip Metal: Brass with tin-cobalt plating, 5-axis lathe machined
• Grip Material: PMMA (acrylic), smoky transparent
• Clip: Long spring-loaded, matte finish
• Cap: Snap-fit for one-handed opening and closing
• Body Colors: Black, Silver

The Fine Writer was developed around a single material challenge: how to give a modern metal pen the expressive line quality typically associated with traditional writing instruments. The answer was a resin tip engineered with microscopic slits. These slits pull ink toward the paper via capillary action rather than gravity or pressure from a reservoir, resulting in a noticeably light touch and consistent flow.

The slight give in the resin tip is intentional. It allows for the stops, hooks, and sweeping strokes that characterize East Asian scripts and expressive lettering, while still functioning well for everyday note-taking. The pen also works when held nearly flat, giving writers more freedom in angle without losing ink delivery.

The body is cut from solid aluminum and given a matte blasted anodized surface. The tip metal section is machined on a 5-axis lathe, which creates both a textured grip zone and the subtle light-catching facets visible near the point. The triangular grip in smoky transparent PMMA runs all the way to the tip, so the refill graphic is visible and the hold stays stable regardless of grip style. The snap-fit cap and long spring clip are designed for one-handed use throughout the writing session.