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TWSBI gray fountain pen ink comes in a 50 ml glass bottle with an anodized aluminum sleeve. The bottle features an inner plastic cone that holds the ink for filling the pen.
The nozzle fits the TWSBI 530, 540, 580, and Mini series. The inner cone also allows ink to be drawn up 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.