TrollFoil 4.5 microns is the thinnest articulating foil ever made. Research shows that the thinner the articulating foil, the better. Thick articulating paper generates a less uniform and larger occlusal contact area than the occlusal area marked with thin articulating foil. TrollFoil 4.5 is double-sided blue color mounted on its own frame eliminating the need for forceps. Marks on wet, dry, and highly polished surfaces, at 4.5 microns thick this super-thin foil gives you very precise markings.