Photo evidence numbers are used in crime scene photographs to indicate where each piece of evidence is found. Usually two photographs are taken of each scene: one with photo evidence numbers and one without. The markers are 7 1/4" x 4 1/2" heavy yellow plastic with a matte finish and black numbers. The A-frame style allows the numbers to nest for compact storage, with ridges on the edge of each marker to ensure that the numbers will not rub off when nested or stacked. The small numbers in the corner are for close-up photography purposes.