Looking to print with abrasive materials on your Ultimaker 3? Then the Hardcore by 3D Solex could be just what you are looking for.
This nozzle is meant to be a used with the Hardcore PrintCore (Hardcore 4 or Hardcore 7). This nozzle has a sapphire tip which resists damage from using abrasive materials so it won't degrade like standard brass nozzles.
Nozzle size: 0.4mm