Faber-Castell Fountain pen Spare nibs fits most Faber-Castell fountain pens and are available in four different nib sizes.
Medium, Broad, Fine and Extra Fine.
The Nibs of both Ambition series and Emotion Series are provided with the housing attached and you may unscrew the section to replace the nib.
The E-motion series has a wider Grip section while the Ambition has the slim Grip section.
Both nib and it's housing (feed) can be unscrewed.
The nib can fit the following series: