xlBorderWeight

Specifies the weight of the border around a range.

xlHairline	Hairline, thinnest border (0.25pt), First line in the list (1)
xlMedium	Medium (2pt), Third line in the list (-4138)
xlThick	Thick, Widest border (3pt), Fourth line in the list (4)
xlThin	Thin (1pt), Second line in the list (2)

xlHairline

Hairline, thinnest border (0.25pt), First line in the list (1)

xlMedium

Medium (2pt), Third line in the list (-4138)

xlThick

Thick, Widest border (3pt), Fourth line in the list (4)

xlThin

Thin (1pt), Second line in the list (2)

REMARKS

* oSeries.Border.Weight = xlBorderWeight.xlThin
* oSeries.Border.Weight = 1.5