This ink cartridge fit for standard fountain pen with 3.4mm bore diameter
Cartridge keeps ink contained so replacing it is a clean process
please confirm that the product diameter is consistent with the diameter of the interface on your pen before purchase
Description
Please remove old Ink cartridge first, then stab the small part of the ink cartridge to the pen body (you will feel and hear a "click" which means the cartridge installed in right place), and please wait a minute for let the ink flow to the nib. If did not work, please change one other ink cartridge to try again.