Indigraph is a pen with a water reservoir on top of the cap to keep the ink always wet, so you can use many types of inks. To know more about this new technology visit the manufacturer webpage: Indigraph
This product is for the pen only: cap, grip section and body, so you will need a nib unit Jowo 5 and use a converter or a cartridge as ink reservoir.
Here are the link to Jowo size 5 units: