The Pilot Fineliner features a tough, polyacetal fibre tip encased in a protective metal sleeve, which prevents the tip from splitting or degrading even under heavy pressure. This durable design allows it to glide effortlessly across paper and cardboard, making it precise enough for detailed sketching yet strong enough to write through several carbon copies this is the go-to choice for students, artists, and professionals who demand consistent performance and sharp, 0.4mm lines.