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The TWSBI Diamond 50 ink bottle contains 50 ml of black fountain pen ink. It features an internal plastic cone that retains ink when the bottle is turned upside down, making it easier to draw up the amount needed to fill the pen.
The bottle’s opening fits TWSBI 530, 540, 580 and Mini series pens, while the cone also allows it to be used with 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.