I love these acrylic plexiglass air vent cover grilles perfect for walls and ceilings (not for floors). MEASUREMENTS: Please order by the opening size. Listed product sizes refer to the duct opening measurements, outer dimensions in most cases are 1" in each direction. The thickness of the material is 1/8". The back of this grille is flat with no protrusion which makes it very easy to attach to the wall or ceiling without any scratches or sides of the cover hanging around. We did paint ours (I just used a white chalk paint) and we used longer screws. They come in white but they were slightly glossy in finish which didn’t match our matte ceilings as well. LTKHome LTKFindsUnder50 LTKVideo