You can render closed shapes with the inner border and the outer border strokes using BorderStyle. It defines the style that describes how the inner border and the outer border of a closed shape will be rendered.

The style is ignored when it is used to draw a non-closed shape, such as a polyline, an arc or a point, or an extruded shape on a 3D map.

Borders can be drawn with a width value that is expressed in pixels or world-size units, like meter of foot, as defined in the BorderStyle.uom property.