The 58mm NDK2-400 filter adjusts light levels and supports creative photography. - Model: NDK2-400 - Size: 58mm - Brand: K&F Concept Thank you for viewing. [Variable ND Filter] The K&F CONCEPT ND2-400 filter reduces light from 1 to 9 stops. * [Material] Made of finished professional optical glass with a double-sided multi-layer blue coating that helps repel water. * [Exposure Reduction] ND filters are suitable for use in water areas such as rivers and waterfalls, especially in bright locations. The longer the exposure time, the smoother the water movement, the shallower the depth of field, and the more blurred the movement. I have lost the box, but I will pack it securely in a case before shipping. Thank you for your consideration.