It is a protective cover attached to a 12cm fan for computer cases. It prevents a finger and an external objects from entering into it. Features: Increase airflow through your computer while maintaining a safe operating environment Suitable for Fan Size : 12cm. Stainless Steel, Chrome Package Content: 1 X Fan Guard (Note : Photo attached is for reference only, it may be slightly varied in items of colour, shape from the actual item delivered from time to time)