Features: Discover the versatility of our Pack of 100Pcs Inks Cartridges, sufficienty quantity to meet daily writing and journaling needs. 3 different color: Black; Blue; and Black Blue. Diameter 2.6mm ink sacs, fit on most fountain pen, retractable inks pen, press fountain pen, calligraphy fountain pen and more. Suitable for student, teacher, officer workers, business professional, women, men. dely used for writing, journaling, taking meeting notes, art handwriting practice, jotting down class lectures, signing important documents, or even as luxurious holiday present for friend and family. These fountain pen refill inks cartridges ensures versatility and convenience for all your writing needs, amking it essential accessories for your school office writing supplies. Specifications: Component: Inks Color: Black; Blue; Black Blue Size: Approx. 50mm/1.97in Weight: Approx. 197g Package Includes: 100Pieces 2.6mm Inks Cartridges note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color