XCSOURCE Square Filter Set 8 Pieces ND2 ND4 ND8 ND16 GND2 GND4 GN8 GND16 + 9 Metal Adapter Rings + 1 Holder + 1 Filter Case for Cokin P LF291 An accessory set with 8 filters, filter rings, and a storage case. 【Package Contents】Square ND Filters x 4 + Graduated ND Filters x 4 + Metal Adapter Rings x 9 + Holder x 1 + Filter Case x 1. Material: Resin. Filter Size: 94mm x 83mm. Allows for special effects through long exposures, such as outdoor portrait photography when using a brighter lens, blurring the background even on a sunny day, making flowing water appear like threads, or removing people from a busy street scene. 【ND Filter 8-Piece Set】Using ND filters allows you to open the aperture or lower the shutter speed during shooting. GND filters reduce the amount of light entering the top of the lens when the weather is clear, darkening the sky. Square filters are used by inserting them into the holder, allowing you to adjust the part of the photo that is affected by the position and orientation of the filter. 【Includes 9 Adapter Rings】By simply changing the adapter ring, the same filter can be used with all lenses. Compatible with 49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 72mm, 77mm, and 82mm lenses. Adapter rings are attached to the front threads of the lens, similar to circular filters. 【Includes 1 Filter Holder】A filter holder is also provided, which is necessary for setting the square filters. Multiple square filters (up to 3) can be used together. By using different ND filters simultaneously, you can take even more stunning photos. 【Includes Filter Case】The filter case is convenient for inserting square filters into the case and preparing for filter changes when using the holder. Thank you for viewing.