30 PCS Jinhao Fountain Pen Ink Cartridges 6 Color Set? Black, Blue, Apple Green, Purple, Red and Orange) International Standard Size

Jinhao ink cartridges have a neutral PH, NON-TOXIC, excellent coverage and smooth flow These standard szie cartridges compatible with most of fountain pens take standard cartridges such as Jinhao, Duke, Baoer,Picasso,and so on ( Not compatible with The LAMY and PARKER FP ). Instructions on How To Fill a Fountain Pen with Cartridge :https://youtu.be/aDD-He8hRmM