This Big Brush Pen contains four times the amount of pigmented India Ink than the PITT Artist Pen, offering ample coverage for work in large formats. The ink is smudge-resistant and waterproof when dry. This pen has large tip for both wide full strokes and narrow detailed strokes. Ideal for sketches, journals, cartooning and fine ink drawing, this pen is blendable while wet for a variety of effects and permanent when dry - great for layering.