Weight Property

Returns or sets the thickness of the specified line, in points. Read/write Single.

Example

This example adds a green dashed line two points thick to myDocument.

Set myDocument = ActivePresentation.Slides(1)
With myDocument.Shapes.AddLine(10, 10, 250, 250).Line
    .DashStyle = msoLineDashDotDot
    .ForeColor.RGB = RGB(0, 255, 255)
    .Weight = 2
End With