Glass bottle with an impressive design made of anodized aluminum, with a capacity of 50ml for ink.

TWSBI Diamond 50 ink bottle, Red

Ideal for refilling ink in the 530, 540, 580, and Mini series of the company, as the pen's nib fits precisely into the bottle's opening.

Provides the ability to fill the pen with absolute ease and safety.

Turn the bottle upside down and an internal plastic cone inside holds just the right amount of ink needed for filling the pen.

It is equally suitable for use with pens from any company, thanks to the built-in internal plastic cone that allows for drawing the required amount of ink until the pen is filled.

A fantastic, functional, and aesthetically pleasing pen accessory from TWSBI.