One of the oldest and most prestigious fountain nib manufacturers, Bock nibs stand for precision, quality and value.
All nibs include the Bock Housing and Feeder system. To change over the Nib in a pen kit you will need to use the existing housing and feeder system.
Generally the large pen kits (Majestic, Churchill, Cambridge) will need a Type 250 (Size #6) and all others a Type 180 (Size #5).
Nib sizes, from small to large, are Extra Fine (EF), Fine (F), Medium (M), Broad (B), Extra Broad (BB)