Abstract: A film holder having an integral core and core for film holders, wherein the core is composed generally of a collar having an inside wall of a predetermined shape and a hub concentric with respect to the collar. The hub has an outside surface which is in part symmetrically shaped with respect to the inside surface of the collar so as to provide a film channel, and in part separated from the inside surface of the collar to provide open areas for facilitating film loading and film posting. The channel provides very easy loading of the film and yet further provides an extensive length along which the film is caused to be curvaceously bent in an over-all arcuate shape which results in sufficient friction so as to retain the film on the core even when longitudinal forces are applied to it, and yet further not subject the film to an untoward strain at any location.