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The green Twsbi fountain pen ink refill comes in a 20 ml plastic bottle. The bottle is designed for carrying ink and is compatible with regular-size and Mini Twsbi Vac 700 pens.
To refill, screw the pen onto the bottle with the nib immersed in the ink, which is drawn up through the pen. The cap is compatible with 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.