This is their second largest nib.
In this video you can see how it is attached to the pen,
I compare the 6mm to the 5 mm ink feed.
You can see how the nib reacts to the writing hand, how flexible it is.
The smallest #060 steel nib is also used to compare the Bock nibs to a Brause nib.
Edited by turnero, 21 November 2011 - 13:36.