This property is displayed when the Cursor Style is set to Crosshair.
Setting this value will override the default standard Crosshair lines width of 2 pixels.
The value entered is in pixels (this value is relative to the web page as depending on your monitor it will probably be more than 2 "pixels").
In a Profile, this value can be inherited from a linked, parent profile. The Track Marks () will indicate if the value is default, from the parent Profile or unique to this profile.