DGK Color Tools DGK-573 3 Card White Balance Set - 5" x 7" Size 18% Gray Card for Digital and Film Photography with Premium Lanyard Made in USA by DGK Color Tools, the White Balance Authority (tm) Our largest 3 card set - includes three 5"x7" size color calibrated reference cards Includes premium adjustable carrying strap with detachable clip and safety release Complete, easy to follow instructions included Works with any digital camera, for JPEG and RAW files