COPIC Multiliner Black Pens - The COPIC Multiliner pen is the ultimate drawing pen. COPIC Multiliners draw in deep black ink. The ink is waterproof and COPIC marker proof; so you can do drawings using these pens and then color them in with watercolors or COPIC markers. The pen knibs are replaceable, and there are replacement ink cartridges. Each pen includes the pen barrel itself, one knib, and one ink cartridge. Deep black, pigmented ink (not dye).