Features: 1.The package contains 50 pieces fountain pen ink in this package, there are different colors for you to use and change, you can replace or fill you pen conveniently, and the sufficient quantity will satisfy you various needs 2.Independent ink tube, easy to carry and use, take out the pen of the suction apparatus, and then put the ink sac, after a few seconds can be writing. 3.Ink particles are fine, good fluidity, easy to plug the pen. 4.They are suitable for daily writing use in school, office, home, you can also use them to make card, write letter, make crafts and so on; These pen ink cartridges are also fit for rewarding someone in learning progress 5.You can present this fountain pen ink to yourself as backup, you can also send to your sisters, brothers, relatives, colleagues as a gift at Thanksgiving Day, birthday, graduation, family gathering, holiday or other occasions Descriptions: Type:Ink Cartridges Style:Fountain Pen Ink Writing Point: 0.5mm Case Material:Plastic Color:Clear Ink color:Erasable Crystal Blue,Dark Blue,Black,Red Outer diameter:5mm Inner diameter:3.4mm Length:50mm Quantity:50pcs manner of packing:OPP bag/Canned Main applications: office and stationery Note: 1.Please allow 1-3 cm error due to the manual measurement. Thanks for your understanding. 2.Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Package List: 50pcs*Ink Cartridges