●Suitable for DSLR, Viedo, White Balance, Exposure Measurement etc. ●The grey card is used to accurately capture the exposure, can compensate for up to 18% neutral grey scene. The white balance card defines the white balance that can be used as a reflector but has a limited effect. The black map covers scattered light. When shooting outdoors, reduce exposure and balance the light content. ●The compact and weather-resistant grey card set allows quick and easy image optimisation during recording and also offers valuable help in the later post-processing of the image material on the computer. ●Made of plastic, small and lightweight, easy to carry. ●Package includes 3 cards including black card, white card and grey card, comes with 1 red lanyard.