mathematical notation

gets it done

it's easy to clean with any solvent-based liquid or spray cleaner and can be reused

or jotting down ideas without the restriction of lines

It ships with a cleaning bulb and a starter ink cartridge

uni pin fine line pens brush art 5 set Mere mathematical notationCreated for expressive linework and painterly effects, this brush pen set features five water resistant pigment markers in shades of black, sepia, and grey. Use them for manga, ink washes, shadowing, or calligraphy style strokes with a brush like feel. Uni Pin Brush Pens combine the flexibility of a brush with the precision of a technical pen. With archival quality ink and durable fiber tips, they're great for mixed media sketching and graphic