A shrink label is a printed piece of plastic, unsupported by liner or adhesive, that is placed around a container, seamed, and heated to a temperature that will cause the film to shrink to the exact contour of the container. Most shrink labels are plastic sheets that are formed into tubes, or sleeves, by the use of a seaming machine. The sleeve is then slipped onto the container and then shrunk in the heat tunnel. Another type of shrink label is called roll-on shrink-on. This process involves cutting the label directly from the printed roll of film, wrapping it around the container, seaming it at that point, and then heating it for the shrink process.