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TWSBI fountain pen ink comes in a glass bottle with an anodized aluminum outer casing. The inner plastic cone holds the ink when the bottle is turned upside down, making it easier to draw up the amount needed to fill the pen.
The bottle fits the TWSBI 530, 540, 580, and Mini series, and is also suitable for pens from other brands.
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.