This is the hocoro Dip Pen Exchangeable nib, a part that makes it easier and more convenient to use bottled ink for fountain pens with the hocoro Dip Pen.

Play with more ink colors, the casual and durable way.
You can enjoy a wide variety of fountain pen ink colors without the conventional messy fuss.
All you need to do is simply rinse the nib with water and wipe dry.

Reservoir is NOT installed.