Refill for Donau automatic gel pen 0.5 mm waterproof ink blue, pack of 10

Donau refill for automatic gel pen 0.5 mm with waterproof blue ink, supplied as a pack of 10, is designed for use in compatible click-action ballpoint and gel pens. The refill features a 0.5 mm fine tip that produces precise lines suitable for everyday writing and detailed note-taking. The waterproof blue gel ink dries to a stable, water-resistant mark that helps preserve documents and reduces the risk of smearing after exposure to moisture.

Advantages

The refill offers consistent ink flow and reliable tip performance for smooth writing across pages. Waterproof blue gel ink improves document durability and is suitable for records or materials that require resistance to water contact. The 0.5 mm fine point balances legibility and precision, and the pack of 10 provides ready replacements to maintain uninterrupted use of compatible automatic pens.

Suitable for

• Everyday writing and note-taking
• Office forms and administrative documents requiring water-resistant ink
• Schoolwork, sketches and detailed annotations
• Archival or record-keeping tasks where ink permanence is important

Key specifications

• Tip size: 0.5 mm (fine)
• Ink type: gel, waterproof
• Ink color: blue
• Pack quantity: 10 refills
• Compatibility: designed for automatic (click) gel/ballpoint pens accepting standard 0.5 mm gel cartridges

How to use

Remove the used refill from the compatible automatic pen according to the pen manufacturer's instructions, and insert the Donau 0.5 mm gel refill until it seats firmly. Extend the tip using the pen's click mechanism and test on scrap paper to confirm smooth ink flow. Replace refills as needed when ink runs low or writing becomes faint, and store unused refills capped or in original packaging to prevent drying.

Usage recommendations

For best results, allow a few seconds for the gel ink to dry on glossy or coated paper to avoid smearing. Use the refill in pens that specify compatibility with standard 0.5 mm gel cartridges to ensure proper fit and reliable performance.