You use the Property module to create a skin reinforcement on the face of a three-dimensional part or along the edge of an axisymmetric part. You can assign only shell, membrane, surface, or gasket elements to a skin reinforcement. In addition, the geometric order of the elements that you assign to the skin must be the same as the order of the underlying elements. You use the Mesh module to assign an element type to a skin reinforcement. When you are prompted to select the regions to be assigned element types, you must select the selection filter tool that appears in the prompt area and then select Skins from the list of objects to filter.