Monteverde Replacement Nibs for compatible fountain pens are widely available in different nib sizes like extra fine, fine, medium, broad, stub and omni. Stainless steel nibs.
This is a #6 nib which will fit Monteverde Invinvia, Prima, Intima, Regatta, Rodeo. The nib will not fit the Artista and tool fountain pens which use #5 nibs.