The line thickness of the fibre needles depends on the tip design. As a consequence, there are types, especially among the fibre gratings, whose line thickness is not a fixed value due to their cut tip, but falls within an interval. In the case of conical and needle-tipped pens, on the other hand, the line thickness is fixed.

Automatic pressure equalization prevents the pen from leaking on board an airplane.

The Triplus 323 and 334 models can be combined with each other.

Ergonomically designed shape

It does not dry out for certain time without the cap.