Metallic paints, or just metallics, generally consist of a base coat with a clear “lacquer”, usually a transparent acrylic polyurethane top coat, for protection and extra gloss. Flop”, or “flip-flop”, refers to the difference between the amount or hue of light reflected at different angles from a metallic paint surface. The differences are caused by the size and reflectivity of the flakes in the paint, and also by their orientation and the degree to which they are all oriented in the same direction. Metallic paints may be generically referred to as metal-flake paint, but a specific variation uses larger flakes of metal that are individually visible. Flakes with different colour effects may also be used within the same paint.