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The Twsbi black fountain pen ink refill comes in a 20 ml plastic bottle. The bottle is suitable for carrying ink and is compatible with the Twsbi Vac 700 and Vac 700 Mini fountain pens.
To refill, screw the pen onto the bottle with the nib submerged in the ink, which is then safely drawn into the pen. The cap fits the Twsbi Diamond 50 series.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.