135 film
Individual rolls of 135 film are enclosed in single-spool, light-tight, metal cassettes. This allows cameras to be loaded in daylight. The film is clipped or taped to a spool and exits via a velvet-covered slot. The end of the film is cut on one side to form a leader, which is to be inserted into a corresponding slot in the camera take-up spool. It has the same dimensions and perforation pitch as 35 mm movie print film.