**Feature** Ink Cartridges: 2 cartridges ×2 Packs/total 4 cartridges Water-based Black ink It is an authentic fountain pen of the cartridge-type which attached the alloy to the nib. The alloy of a nib reduces friction with paper and realizes a smooth feel of writing. Size:1 Ink Cartridges: 2 cartridges ×2 Packs/total 4 cartridges. Water-based Black ink. It is an authentic fountain pen of the cartridge-type which attached the alloy to the nib. The alloy of a nib reduces friction with paper and realizes a smooth feel of writing.