The DGK Color Tools XL Size Digital Grey Kard Model DGK-XL is an accurate, waterproof and durable white balance card / 18% gray card for film and digital photography. Our new XL size card makes it super easy to fill the viewfinder for white balance shots. The DGK-XL consists of three XL-size color reference cards, both sides matte finish and spectrally neutral. The cards are easy to carry in your pocket or in your bag, plus they are 100% waterproof and durable enough to take anywhere. Each card measures 4" x 5" or approximately 102 by 127 millimeters. The cards are supplied with easy to follow instructions and a premium adjustable carrying strap with detachable clip and safety release.