expression.Weight
expression Required. An expression that returns one of the objects in the Applies To list.
Example
This example sets the axis line and border weight of the chart to thick.
Sub FormatChart()
Dim chConstants
Set chConstants = ChartSpace1.Constants
ChartSpace1.Charts(0).Axes(chConstants.chAxisPositionValue).Line _
.Weight = chConstants.owcLineWeightThick
ChartSpace1.Border.Weight = chConstants.owcLineWeightThick
End Sub