Specification Brand : BUZHI BulletPoint1 : The black card achieves truly deep blacks (RGB 16,16,15). BulletPoint2 : The grey card displays superior spectral neutrality with measured values of 162, 162, 160. BulletPoint3 : The white card has a tested RGB value of (220, 224, 223). BulletPoint4 : The neck s-trap with quick-release plastics buckle on the end, convenient for your use. BulletPoint5 : Includes three color calibrated reference cards. It helps you get correct white balance, or color balance, allowing the camera to compensate for the illuminant color in a scene. Color : Multicolor ItemName : BUZHI White Black 18% Gray Color Balance Cards White Black 18% Gray Color Balance Cards Digital Grey Card with Neck-Strap White Balance Card Photography Accessory. ItemPackageDimensions_Height : 3.35 inches ItemPackageDimensions_Length : 0.12 inches ItemPackageDimensions_Width : 2.17 inches ItemPackageQuantity : 1 ItemTypeKeyword : photographic-light-meter-grey-cards Manufacturer : BUZHI ModelName : Grey Cards ModelNumber : Grey Cards PartNumber : MSUS-D8535-HKX ProductDescription : The digital gray card and white balance tools are perfect 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 a perfect addition to any s-tudio because it allows you to create s-harp i-mages that really reflect the color of the scene.