High quality pigmented drawing inks, very lightfast and waterproof when dry. Odour-free, Acid-free, PH neutral. Does not bleed through paper. Brush tip for fine to broad marks, semi flexible for controlled application of colour. Instructions: Also available in other nib styles; soft brush, medium, fine, superfine, Xsuperfine, bullet 1.5, calligraphy, soft chisel, big brush black, and 2.5 bullet white.