Osprey 14K gold nibs are tipped with excellent German iridium tips (just like the #6 Steel and Gold-plated nibs). Though not a flex nib as such, Gold nibs are more flexible due to the softness of the metal and hence impart greater character to one's writing. Expected line widths associated with the nib size: Extra-Fine (EF) – 0.55mm, Fine – 0.65mm, Medium – 0.75mm, Broad – 0.9mm.