The Mass Filter COKIN 25in1 Set includes a comprehensive selection of ND gray filters designed for photographers and videographers to control the amount of light hitting the sensor. With a filter diameter of 49 millimeters and a thickness of 2 millimeters, these screw filters are easy to handle and provide precise adjustments for various shooting conditions. The set not only includes the filters themselves but also a practical case for safe storage, two handles for improved handling, as well as a cover and a cleaning kit to keep the filters in pristine condition. The gray color group of the ND filters allows for reducing exposure without affecting color balance, which is particularly advantageous in bright environments. This set is ideal for anyone looking to enhance their photographic and videographic skills by gaining creative control over light and exposure.