- Nib: B (Broad)
Opus 88 spare nib for the large fountain pens, size 12 (Opus) Size 6 Bock nib.
The nib fits the Opus Bela pens.
Steel nib for your Leonardo fountain pen set in a screw in unit. With a spare nib you can replace the nib on your pen, or you can use a spare nib to bring some extra variation to how you use the pen.