Black Fountain Pen Cartridges 6pk

Been using these in my Tornado pen all week and the rich black color has stayed sharp from the first to the last page. Six cartridges is a solid amount to keep in my desk drawer without worrying about running dry.

The ink flows out consistently dark and smooth from the first stroke to the last, and each cartridge clicks in securely without any wiggling. I've gone through two packs already for daily notes and haven't had a single leak or skip.

Cartridges slid into my Tornado pen with zero fuss, and the ink flow started immediately—no shaking or priming needed. Six in a pack means I've got backups for weeks, and the black is exactly what I want for daily notes.