Refill for ballpoint pen uni Mitsubishi Pencil Lacknock UNSA7CNNI blue ink 0.7 mm

Refill for ballpoint pen uni Mitsubishi Pencil Lacknock UNSA7CNNI blue ink 0.7 mm is an oil-based ink cartridge designed to restore writing performance in compatible Lacknock-series retractable ballpoint pens. The refill provides a consistent medium line suitable for everyday writing, note-taking and office tasks. Its 0.7 mm tip balances smooth ink flow with controlled line width to produce clear, legible handwriting on standard paper types.

Advantages

This blue ink refill delivers reliable, even ink distribution that reduces skipping and blotting during routine use. The 0.7 mm tip offers moderate line thickness that works well for general-purpose handwriting and documentation. The refill is engineered to be compatible with Lacknock-series retractable pens, enabling quick replacement and restoring the pen to full functionality without changing the barrel. The oil-based ink dries quickly on common paper, helping to minimize smudging in everyday applications.

Suitable for

• Everyday handwriting and note-taking
• Office documentation and forms
• Schoolwork and study notes
• General-purpose signatures and annotations

Key specifications

• Ink colour: blue
• Ink type: oil-based (ballpoint)
• Tip diameter: 0.7 mm (medium)
• Compatibility: designed for Lacknock-series retractable ballpoint pens
• Line behaviour: consistent flow with standard line width

How to use

To replace the refill, extend the pen barrel according to the manufacturer's instructions, remove the empty cartridge and insert the new UNSA7CNNI refill until it seats securely. Retract and test the pen on scrap paper to ensure consistent ink flow. Store unused refills in a cool, dry place and avoid exposure to direct sunlight or extreme temperatures to preserve ink quality.

Usage recommendations

For best results, use this refill with genuine Lacknock-series pen barrels to ensure proper fit and writing performance. If ink flow is inconsistent after installation, write several test lines to prime the tip before use.