The durable plastic nib (PN) provides skip-free writing, and a fine or medium line width (.4mm to .5mm) can be achieved, based on writing pressure. The polyacetal nib structure allows for smooth ink-flow whether writing fast or slow writing for right or left handed users by writing at an angle. Ideal for use on paper. Pigma archival quality ink is waterproof, chemical and fade resistant, bleed free, quick drying and pH neutral. Meets ASTM and ACMI non-toxicity standards and is AP seal certified.