Foto&Tech 3 in 1 100% Waterproof Premium Reference White Balance Card- 3 Card Digital Color Correction Tool / 18 Percent Digital Gray Card with Carry Lanyard (1 Set) Includes three color calibrated reference cards: White, Black & Neutral Grey Cards For perfect color balance, each card 3.3" X 2.1" waterproof plastic Works with any camera JPEG, RAW, film or digital Dependable performance and accuracy Supplied with a premium adjustable carrying strap with detachable clip and safety release