They contain oils, like almost all polishes do, its there for lubrication. While oils may not be "fillers" using a strict definition, they definately hide swirls, so many classify them as fillers. Almost all advanced polishes nowadays contain diminishing abrasives, thats why the products have to be worked in until they flash, thats the point where the abrasives have diminished to the point where they aren't polishing anymore. If you don't believe the meg's products contains oils, let a bottle sit out for a year and see how much seperation you get.