The use of parts on a roll means they are always clean as they come off the roll. They do not attract debris and swarf often present in assembly environments as they are not laying around waiting to be used. They are effectively covered until they are needed to be applied. Counting the parts during manufacturing is easier and so quantity and quality is assured. This method is reserved for high-volume applications as there are special rotary die-cutting tools needed to manufacture the parts. If the material is simply a roll of material without cut shapes then the application of linear lengths can be achieved by running the exposed adhesive in a channel and applying the component (often a long PCB or metal board) to the exposed adhesive side sliding it along and cutting across the tape