Grey filter provides a neutral color for a more balanced exposure when brightness varies,perfect for photography and video recording. Under the strong sun light or the gray cloudy day, the improvement of the shooting effect is very obvious. The grey lens filter can suppress the high light level, making it accurate exposure. Full of practicality especially in landscape shooting. Made of metal and optical glass,durable in use. Specification: Material: Optical Glass+Metal Diameter: 37mm/1.45inch Package Includes: 1 Piece Neutral Density Grey Lens Filter Note: Please allow a slightly errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understanding and attention.