Introduction The Digital Gray Card and White Balance Tools are ideal for helping achieve white balance and color correction. In addition to providing a means for measuring exposure, a gray card provides a convenient reference for white balance, or color balance, allowing the camera to compensate for the illuminant color in a scene. In other words the Digital Color Card is an excellent addition to any studio because it allows to you to create sharp images that really reflect the color of the scene. Size: 8.5cm*5.4cm Package includes: Digital Gray Cards: Gray, White and Black Strap*1