Pockets are hems welded into the vinyl to accept gripper bars for vinyl installation. They are similar to a hem in a curtain. Pockets will be a standard 3" (top, bottom, & sides). This results in a pocket with a 6" circumference. In terms of the vinyl face, the "pocket" is more accurately described as a "margin." A 14' image with 3" bleeds and 3" pockets (or margins) yields a finished size of 15'. (Also referred to as "wrap.") Regardless of whether a board is printed with or without bleeds or margins, the mechanical pocket still exists. This pocket typically is 4" of material, folded over and seamed with a 1" seam yielding a 3" pocket.