
https://www.nfsa.gov.au/sites/default/files/2023-11/Chapter%201%20Block%201000%20x%20745.jpg
A cylinder, of various plastics, wood, or metal, on which a roll of film is wound. Film Cores usually come in three sizes and various gauges:
https://www.nfsa.gov.au/sites/default/files/uploads/2010/10/06/cores.jpg