The Digital Grey Kard - Mini is a calibrated and tested white balance card / digital color correction tool for digital photography. Digital Grey Kard Mini consists of a 1-1/4 x 2-5/8 x 1/8 inch (67 x 33 x 3 mm) color calibrated white balance tool / color reference card, a convenient carrying lanyard with clip, and a user's guide that makes it easy to achieve perfect color balance. Digital Grey Kard's color characteristics are molded into the cards - not painted or sprayed on like the other cards out there. Our cards are quality made in the USA of commercial PVC plastics with pigment-based colorants for color accuracy. PVC-based grey cards are light resistant, exceptionally durable and totally waterproof. This mini-sized card is easy to carry - you can hang it on your keychain. You will never forget to bring it along. Despite its small size it is still a powerful and accurate color balance tool.