Width of border lines.
property Width: TRVStyleLength;
This value is measured either in screen pixels (when printing, it is recalculated according to the printer resolution) or in twips, depending on Units of TRVStyle component which owns this paragraph style.
It's not necessary a total width of a border, It's a width of lines in the border. This property is equal to a width of border only if Style=rvbSingle.
Thick lines (Style=rvbThickInside or rvbThickOutside) have double width.
Note: this default value assumes that RVStyle.Units=rvstuPixels, otherwise it could be too small.