The history of the JoWo nibs goes back to the year 1852. The company started out as the first German manufacturer of steel nibs & today powers some of the best fountain pen brands in the world!
JoWo Compatible Brands: http://danielpi.com/fountain-pens/2015/12/1/nibs-and-who-makes-them
Note: Sometimes manufacturers change their nib designs and suppliers and JoWo nibs might not fit them anymore. Please be sure your pen is JoWo compatible before ordering.