Description: Square gradual gradient neutral density filters for studio photography. Gradient filters help you re-establish balance between colors and reduce contrast between different parts of the image. Accurate downshift or upshift ensure image meet your color expectation. Maintain image quality without excessive post-production work. Control light and colour directly on your raw images at the time of shooting. Specification: Material: HD Glass Size: Approx. 9.5 8.3cm/3.74 3.27inch Package Includes: 1 Piece Gradual Neutral Density Square Filter Note: Gradient lenses can reduce the real-light ratio, improve the picture contrast and color, make the picture exposure transition average, and the photos taken are more layered. 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.