Pilot Petit 2 fun, pocket mini size felt tip pen comes with transparent pen barrel and cap. The color clip on the cap indicated the matching ink color for the sign pen. This pen fitted with the clear transparent ink feeder, which allow you to see the fast ink flow to the felt tip. 

Once the ink cartridge finishes, you can easily buy the replacement ink cartridge for replacement. Each container tube comes with 3pcs spare ink cartridges.

Ink sketch sample video link :- https://youtu.be/VNvWXcInY9s