This International Standard provides specifications for — dimensions of 120-size and 220-size films and of the spools common to both, — dimensions of the backing paper for 120-size film and the leader and trailer paper for 220-size film, as well as the placement of the paster tape used for attaching these papers to the films, — minimum length of film required in front of the leading edge of the first image and behind the trailing edge of the last image, and — markings on the backing paper and the trailer-paper for identification of the intended photofinishing process.