TWSBI bottled fountain pen ink. 70ml supplied in beautiful and satisfyingly heavy frosted glass bottles. Red plastic cap features TWSBI logo.

Supplied with an insert to assist you in getting the last bit of ink from the bottle - just put it in the bottle if needed, and tip the bottle over (with the cap on!) to fill the insert with ink, then fill the pen from the narrow insert.

There's an extra 'hidden' feature to the design too - the cap threads match the , meaning you can swap the caps over to use the clever filling tube from the Diamond 50 with these ink bottles too.