The classic Pilot Fineliner An extremely durable writing instrument. With a hard plastic tip, which also makes it suitable for writing through carbon paper, the Fineliner tip is encased in a metal sleeve which will prevent it from splitting and degrading with age. The Fineliner lets you underline, mark, draw and write with the precision, quality and durability you would expect from a Pilot pen. Pilot uses wear resistant polyacetal tips to provide some of the most dependable and long-lasting felt tip pens in the market. Multiple channel irrigation ensures that there is a constant flow of ink to the tip without leakage.