The product is a set of two OEM vintage computer CPU fan duct shrouds, featuring one black and one purple and made of plastic material. The fan diameter can be seen in the pictures provided. These CPU fan shrouds are designed to provide cooling and protection for computer processors, originating from China. Perfect for adding a touch of retro charm to your computer's cooling system, these fan shrouds are a unique and functional addition to your computer components. They both are expandable.