The Ultimate Marking Pencil is mechanical, so it's always sharp when you need it, and it provides a consistent line width. The line is so thin that thread will cover it. It never smears, washes out, and fits stencil openings. Super-thin lead is 0.5 mm.
Lead Set- Includes: 1 Ultimate Marking Pencil; and 12 refill leads in a handy resealable plastic tube.