Anwenk Grey Card White Balance Card 18% Exposure Photography Card Custom Calibration Camera Checker Video, DSLR and Film CAUTION: Anwenk Grey Card Sold from Vinient Store. Purchase from other seller will not guarantee pure color and DO NOT HAVE refund/replacement service! Neutral 18% Grey / Gray Card with matte finish for scratch resistant. Non Reflective and Waterproof. Perfect for setting exact color balance. Works with any digital camera. Perfect for DSLR, Video, Film and Photography. Card size:3 1/3*2 1/8 inches( 8.5*5.4cm). Small enough to keep in your pocket or on a keychain. Compact, sturdy and Lightweight. Net weight:35.5g Package includes three color calibrated reference cards+premium landyard with a detachable clip.