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Sailor Sou-Boku is a permanent blue-black ink made of nano-pigments. This pack comes with 12 cartridges of Sailor Sou-Boku fountain pen ink.
These cartridges fit in any Sailor cartridge/converter pen other than Chalana.
- Cartridges: 12
- Cartridge Size: Sailor Proprietary
- Color: Blue-Black
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