●Suitable for DSLR, video, white balance, exposure meter, etc. ●Grey card is used to accurately capture the exposure, can compensate for complex light up to 18% neutral grayscale. The white balance map defines the white balance that can be used as a reflector but has limited effect. The black map covers scattered light. Reduce exposure when shooting outdoors and compensate for light percentage. ●The compact and weather-resistant grey card set allows for quick and easy image optimisation during shooting, and also provides valuable help in the later post-processing of the image material on the computer. ●Made of plastic, which is small and lightweight and easy to carry. ●The package contains 3 cards including a black card, a white card and a grey card, with 1 red lanyard.