COPIC Multiliner Black Drawing PensThe 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 drawing 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. Available in many different sizes. The price listed is for ONE pen. Each pen includes the barrel one ink cartridge and one knib. Deep black pigmented ink (not dye).