Set an Outline to "Hairline"

Someone know how i can set the Outline to the "Hairline" ?
i suspect it is not the line thickness but possibly the line type?
Unfortunately, I couldn't get it to work. And the laser cutter needs explicitly the type "hairline".

I use:

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private const double laserLine = 0.01;

private void SetLaserline()
{
     corelApp.ActiveSelection.Outline.Width = laserLine;
     corelApp.ActiveSelection.Outline.Color.RGBAssign(255, 0, 0);
}

Many thanks

Remo