Individual nib units for the Pelikan M605 are easily interchangeable and well suited for customization. The single tone, fully rhodium-plated, 14k gold nib is available in sizes EF, F, M, and B. The M605 nib unit can fit into the M205 and M405 pens, but the nib must be set deeper into the collar. Please specify in the comment box if this nib unit will be used in a M205 or M405 pen.