Usage of Black aluminium foil: Shade the light to get a more accurate range of light. Light Shadow Beam Shape. Used as a custom background decoration. This 0.002inch Heavy foil with a black coating is heat and weather resistant. Black Foil is thick enough that it doesn't collapse too easily. It can easily be positioned in place with tape and adhesives. This Deep Matte Black Foil with practically no reflections use for masking light leaks and eliminating unwanted reflections. It's very easy to form this into snoots, get the shape and size as you want. Make the snoot very small and pinpoint or larger for hair/rimlighting for portraits. Also Use for small items, especially food shots on location. It'll provide a shade over your lenses, you can use as a flag, a grid or other light controlling configurations. You can bend the foil several times without breaking then store in your bag. The foil works with the tungsten lighting, flash and continuous lighting. It is able to adequately handle the heat. Great for controlling the location of the light, or making a "spotlight".