Rolleicord belongs to Lulai 120 double reverse machine and uses 120 film. 120 film is different from 135 film, which requires cassette. It is covered by film backing paper (dark black and opaque). The back paper and film at the front end are connected by adhesive tape, and the back end is separated and cannot be wound back. When you finish filming the back paper, you wrap all the films. Generally, there will be a small piece of paper with glue that says "Shooting finished", which can be used to paste the film to prevent it from loosening naturally and shooting again.