When properly applied, stretch film will become more narrow as it is stretched. So an 18 roll, for example, will “neck down” to as few as 14” when optimally stretched. Blown films neck down more than cast films, and cast film more than pre-stretch. If applying by hand, the most common sizes range from 11” to 20” in width. Machine films begin at 20” in width and typically step up in 10” increments up to 60”. The wider the film, the fewer rotations required to contain around a pallet, but the more narrow films are lighter and can better suit short pallet loads and certain bundled applications.