One Pen, Many nibs: Choice of Additional Nibs:

Keeping in line with the Osprey philosophy of interchangeable nib units, a wide variety of nib units are offered below that will work with this pen.  Click on the hyperlinked choices to learn more about the nibs.

• Choose from Osprey Regular Size 6 nib units in Steel or 2Tone. All Regular nibs used for everyday writing, come with a plastic feed and accept international standard converters or pre-filled ink cartridges, giving you the flexibility to use either bottled ink or pre-filled ink cartridge. The pen is fitted with an Osprey custom converter by default and is packaged in a premium pen box.

• #6 Steel  Economical Special Grinds such as the Architect Broad, Architect BB, Zoom BB, Broad Left-Oblique or Broad Right-Oblique, Broad-Stub or Double Broad Stub. Similar to the Regular Size 6 nibs, the Speciality Grind nibs also accept international standard converters or pre-filled ink cartridges, giving you the flexibility to use either bottled ink or pre-filled ink cartridge or use with Osprey custom converter. 

•  #5.5 Ultra-flex, #6 Ultra-flex (second generation), Zebra G or Titanium Ultra-flex assemblies:  Ultra-flex (UF) nibs are for ardent calligraphy users! You can purchase these as complete assembly for a seamless plug & play experience, or buy just nib units to swap. The assembly consists of an ultra-flex nib unit of your choice, which threads into the Outer Section of the pen, and comes with an Osprey converter. Only fountain-pen friendly inks  are recommended to avoid clogging the feed.

All ultra-flex and Zebra G nib units come with ebonite feed. Size 5.5 Ultra-flex, Zebra G Flex and Titanium Ultra-flex are non-cartridge type, meaning they do not take any prefilled ink cartridges or international converters. They are made to work with custom Osprey converters. Size 6 Ultra-flex nib units (second generation) on the other hand, take both, cartridge or  converter, which means you can use prefilled ink cartridges or use bottled ink.

If you choose #5.5Ultra-flex or Zebra G flex nib-units/assemblies, be sure to add a nib-block kit , if you don't already have one. You can download a maintenance guide that helps in easy disassembly and assembly, when the feeds get clogged over time with use. The nib block does not accommodate size 6 nibs, you will instead need to use the grip provided in the kit for disassembly and assembly.