The Pigment Liner is a fine line pen for writing, sketching, and drawing. It features a long metal tip that is ideal for use with rulers, templates, etc.The pen-s pigment ink is indelible, lightfast, and waterproof. It-s also erasable when used on tracin ng paper and won-t bleed when highlighted.The pen has a metal clip for easy carry and a sturdy plastic barrel for long service life.The Pigment Liner has a line width of 0.3 mm.