Pockets are created by folding over 3.5" extra vinyl and heat welding it to the back of the banner, creating a pocket to slide a pole into. They are usually placed at the top and bottom edges of the banner. The top pole is usually attached to the ceiling or other structure above using ropes or cables, while a dowel rod is inserted into the bottom pocket for extra weight. Pockets can be used on the left and right side if you have an existing pole system in place. Some frame systems for hanging banners require pockets on all four sides (no additional cost). Grommets cannot be placed over a pocket since it would close up the pocket.