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.

A green product that is manufactured with lower energy consumption, reduced emissions of harmful substances, less waste generation, less chemical usage, or reduced packaging material usage.

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