COPIC Multiliner Four Pack - Set A - The COPIC Multiliner pen is the ultimate drawing pen. They are made to mimic old fashioned technical pens- only without the mess. COPIC Multiliners draw perfect, precision lines 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. Perhaps best of all, they are priced at nearly one quarter of the cost of most other technical pens. Each pen includes the pen barrel itself, one knib, and one ink cartridge. Deep black, pigmented ink (not dye). This convenient set comes in a reuseable plastic carrying case that snaps closed. Included in the set are Multiliner sizes 0.03, 0.1, 0.3, and 0.7.