zusooz Black Crystal Rhinestones License Plate Frame Holder, Clear Bling Bow, Woman Car Bling Accessory (Black w/Silver) 7 Rows of Premium quality Rhinestones used for a long life of luster and sparkle (not acrylic which cloud and fog over time) Crystal (Glass) rhinestones, which are used on these plate frames: The light reflections from the rhinestones are beams of "rainbow color" light rays. Crystal rhinestones are more expensive but it's more durable and has a longer lasting luminosity. The stones do not become cloudy, dull or discolored due to the hard material used to manufacture them. Acrylic (Resin) stones on the other hand are less expensive but do become cloudy, dull, easily scratched and discolor due to the relatively softer material used when producing them. The light reflections are mono-toned created by a shiny foil layer adhered to the back to create the light reflection since the stone is unable to reflect light on its own due to the material used. The simulated refection is not as colorful as a Crystal stone. 2 matching screw cap covers included with each plate frame