Ink Pen Refill Cartridges Set of 15

• ✅ LARGER PACK: 15 pack of 3.4 mm bore diameter black ink cartridges ( compatible with fountain pens take 3.4mm cartridges such as Zucfan, parker and wing sung )
• ✅ DIMENSION: Length Appr 51mm; Cartridge Diameter Appr4-7mm; bore diameter 3.4mm
• ✅ SMOOTH INK FLOW: With no break in ink flow, enjoy a smooth and optimal writing experience as your fountain pen glides elegantly across paper.
• ✅ 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: Zucfan Designs ink takes only a few seconds to dry ensuring your important writing moments are not ruined by smudges or smears.

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.