This sexy baby is a Koh - I - Noor 3x0 Rapidograph. The god of all pens! I bought this a few weeks ago, used it once and broke it like an idiot. I bent the thin wire that feeds the ink onto your paper. It cost 20 dollars to replace the tip (2/3 of the original cost) so I wont be doing that again! I haven't received the replacement yet and it's KILLING me! I need it!!! These pens were used by animators before computers, animation software...etc. They haven't been used much since then but they are apparently rising in popularity. Which is fantastic because I can say without a single doubt, Rapidograph pens are the best art pen ever constructed! You also have to buy your own ink separate so you can fill it with whatever your heart desires.