You can use BorderStyle to define styles for the inner and outer border strokes of closed shapes.
The BorderStyle describes the rendering of the inner border and the outer border of a closed shape.
The style has no effect if you use it to draw a non-closed shape, such as a polyline, an arc, a point, or an extruded shape on a 3D map.
You can express the width value of the borders in pixels or world-size units, such as meters or feet, as defined in the BorderStyle.uom property.