Muuto does not assign material properties inside our Revit families. We provide individual sub-categories inside each family, allowing for material assignments to elements that share the same finish. These are also instance parameters if similar products (such as family types) need to have unique finishes. In the Project Editor, under the Manage tab, choose Object Styles. On the Model Objects tab, click in the Material column and set materials to subcategories. Materials are not included with the RFA files.