Description The Faber-Castell Essentio fountain pen in Black Carbon features a a resin over carbon fiber body and cap, and an ergonomic grip section that makes it the perfect pen for the office or for long writing sessions. The Essentio fountain pen was formerly called the Basic.The barrel features an ink window, so you always know how much ink you have before taking off the cap. The Essentio has chrome-plated accents and clip, and the spring-loaded clip can easily slip onto a shirt pocket or notebook and holds the pen securely.The steel nib is removable for easy cleaning and flushing and is also interchangeable with other Faber-Castell fountain pens! The Essentio fountain pen comes with one cartridge and additional spacer cartridge. Two cartridges will fit in the barrel end to end so you will have a spare whenever it is needed. The Faber-Castell converter sold separately.