30 PCS Jinhao Fountain Pen Ink Cartridges Refill 6 Colors Set（ Black, Blue, Apple Green, Purple, Red and Orange) International Standard Size 2.6mm bore diameter
Brand: Lanxivi
Color: Mixed Color

Jinhao ink cartridges have a neutral PH, excellent coverage, smooth flow.
How to fill a fountain pen with cartridges:
Insert the narrow end of the new cartridge into the black of section block with enough pressure to create a snug fit. The pin inside the section block will puncture the seal of the cartridges, allowing ink to flow into the section block. Screw the barrel on over the cartridge into the section block.
When you fill the pen at the first time, you can swing the pen to make a few drops of ink coming out of the nib, so that it can flow easily.

Jinhao ink cartridges have a neutral PH, NON-TOXIC, excellent coverage and smooth flow
Cartridge Lenght: Appr 51mm; Cartridge Diameter: Appr4-6mm; Bore diameter: 2.6mm
Compatible with fountain pens take 2.6mm standard cartridges such as Jinhao. If you not sure if they works with your fountain pens, just send us a message to confirm this.
Package: 5 black, 5 blue, 5 apple green, 5 purple, 5 red and 5 orange ink cartridges, total 30 PCS ink cartridges.
100% Money Back Guarantee :If you are not satisfied with this purchase, just send us a message ,we will either refund you or send your replacement.