30 PCS Asvine Hongdian Fountain Pen Ink Cartridges 6 Colors Set (Black, Blue, Green, Red, Purple, Light Blue), 3.4mm Bore Diameter

• [ LARGER PACK ]: Set of 30 PCS cartridges in 6 colour, 5 quantity for each color ( Black, Blue, Green, Red, Purple, Light Blue )
• [ DIMENSION ]: Length Appr 51mm; Cartridge Diameter Appr4-7mm; bore diameter 3.4mm ( compatible with fountain pens take 3.4mm cartridges such as hongdian)
• [ NEUTRAL PH & NON-TOXIC ]: The ink has been carefully manufactured using only natural dyes giving the composition a neutral, natural, and non-toxic PH.
• [ QUICK TO DRY ]: HongDian Designs ink takes only a few seconds to dry ensuring your important writing moments are not ruined by smudges or smears.ountain pen ink cartridges refills have been carefully manufactured using only natural dyes giving the composition a neutral, natural, and non-toxic PH
• [ EASY TO WRITE ]: With no break in ink flow, enjoy a smooth and optimal writing experience as your fountain pen glides elegantly across paper.

Notice: These cartridges are Not standard size, Please ensure your fountain pen takes 3.4mm bore diameter cartridges. 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. 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.