These pens have a waterproof, quick-drying pigment ink that will not feather or bleed through even the thinnest papers. The colors included are black, blue, red, green, and sepia. Details: Includes assorted colors 0.35 mm tips 6 pens The inks are smearproof once dry and fadeproof against sunlight or UV light Archival quality Conforms to ASTM D 4236