The Ahab is a piston-fill pen (you can only use bottled ink) with a flex nib that allow for line thickness variation depending on pressure used during writing.
If you like tinkering with your pen, then this one is for you! Noodler's Ink pens are designed with that in mind! We recommend that you flush out the pen before use, using lukewarm water and a small drop of washing detergent (but don't make it soapy) to remove manufacture residue such as dust or lubricant oil from the nib feed. This will ensure a smooth ink flow.