Jinhao Fountain Pen Black Ink Cartridge International Standard 2.6mm Bore Diameter Ink Refill Set of 30 PCS
Jinhao ink cartridges have a neutral PH, excellent coverage, smooth flow
Instructions on How To Fill a Fountain Pen with Cartridge :
https://youtu.be/aDD-He8hRmM
Check more fantastic fountain pens in our store at :
www.amazon.com/shops/lanxivi