The Caruba 3-in-1 Foldable Gray Card 30cm is a handy tool for every photographer. With these cards you can easily set the white balance and exposure of your camera, which in turn saves a lot of time in post-processing because the color and tone of your images is immediately correct. The card has a gray, black and a white side. The rear has a three-part silver-colored reflection screen. Once unfolded, the Caruba Gray Card has a diameter of 30 centimeters.