Fabrication items can be imported into Revit. Revit will need access to the Fabrication configuration that created them.  They can only be imported into a Revit model that contains no other fabrication parts.

If you need to send fabrication parts to a Revit user that does not have access to your fabrication configuration, you'll want to create the Revit file and import them yourself and send them the Revit file.  

If they do have access to your Fabrication configuration, you can send them the MAJ directly.