The FotoTech White Balance Card Set for Digital Photography is an excellent tool for achieving perfect color balance in your photos. It is Small, portable . You can use it under any lighting condition, both pre- and post-production. This set includes an 18% grey card, a white card and a black card. Detachable breakaway safety clip allows card use away from the lanyard.By using this set of three cards - Black, White and Neutral Grey simply take a picture of the card in the same lighting your subject is (or was) in. Use auto white balance and P (Program) mode for the picture. You can either use the resulting picture as the basis for a custom white balance setting, or you can use the White Balance Card Set picture during post processing for a custom white balance. Specifications: Cards set measure : 3.3 inch X 2.1inch Weight: 1.2 oz What"s included: 1 x FotoTech White Balance Card Set, 1x FotoTech Velvet Bag: 9.5cm x 6cm * All images Copyright FotoTech. All Rights Reserved.