Technical Drawing Marker .4mm by Alvin TechLiner
Contain extremely fine polyacetal plastic nibs set in 0.5mm stainless steel sleeve for smudge-free inking. Disposable technical pens are ideal for precision drafting free-hand drawing or any design work. Water-based pigment ink is non-bleeding waterproof and fade-proof. The acid-free archival quality ink is also quick drying and lightfast. Nib size is 0.4mm. Average write out is approximately 3400 ft.