If you are looking for a professional and affordable white balance exposure photography card, then your research is over here. That's because our product can meet your need. Adopted of premium material, it is practical and durable for long time use. It is not easy to get deformed and bring you much convenience. Features -Color: Black, White, Grey - Material: plastic - Size: 8.50X5.50X0.20cm/ 3.34X2.16X0.08in - Three-in-one digital color correction device: a gray is used to accurately detect exposure, which can balance complex light to 18% neutral gray scenes. - White cards are used to define white balance; when shooting outdoors, use black cards to cover stray light, reduce exposure, balance light ratio. - A good helper to take wonderful photos or videos for you small, sturdy, waterproof and light. - It is professionally calibrated to help you get the correct white balance or color balance, so that the camera can compensate for the color of the light source in the scene.