Pilot Gtec C4 Gel Rollerball Pen - Black - Pack of 4

The gel ink is highly permanent once dry, but it is not explicitly classified as archival or waterproof for long-term outdoor exposure.

Yes, the Pilot Gtec C4 is designed as a refillable pen. You can purchase compatible Gtec C4 refills to extend the life of the pen barrel.

Many left-handed users appreciate the fast-drying nature of the gel ink, which helps prevent smearing while writing.

The pen features a 0.4mm tip size, which translates to a crisp, fine 0.2mm line width on standard paper.

Yes, the deep black gel ink is typically acceptable for official documents, but always check specific institutional requirements for ink permanence.

For best results, store them horizontally. This keeps the gel ink near the tip and prevents it from settling at the back of the cartridge.

Check the tip for paper fiber buildup or dried ink. Wipe gently with a soft cloth and try writing on a piece of scrap paper to restart the flow.

Ensure you are using the pen at a slightly lower angle to the paper. Also, verify that the paper quality is smooth, as the extra-fine tip can catch on textured or porous paper fibers.

The cartridge may be nearly empty. Check the visible ink level in the barrel and replace the refill if the gel reservoir is depleted.