This .NET class wraps the AcGiMaterialTraits ObjectARX class. This class allows material definitions to be expanded to implementations.

Autodesk.AutoCAD.GraphicsInterface.SubEntityTraits
    Autodesk.AutoCAD.GraphicsInterface.DrawableTraits
        Autodesk.AutoCAD.GraphicsInterface.NonEntityTraits
            Autodesk.AutoCAD.GraphicsInterface.MaterialTraits

Public abstract Class MaterialTraits
Inherits NonEntityTraits

public abstract class MaterialTraits : NonEntityTraits;