JoWo #6 Fine (BLACK)
This nib unit (nib included) will screw into the section of any of my pens which are JoWo # 6 nib unit compatible.
If this is intended for use with an aerometric filling pen, you'll need to select "breather tube." (Since I didn't design this nib unit, I have to do more work to prep it for use in an aerometric filling pen. Hence the $5 difference in cost between "breather tube" and not selections.)