Abstract: The looseleaf binder ring assembly disclosed herein consists of a one-piece backbone formed of a resilient plastic material, which backbone has a plurality of pairs of cooperating fingers pivotally mounted thereon. The fingers of each pair face one another and are movable between open and closed positions with respect to each other; they are mounted in the backbone in specially formed recesses which prevent inadvertent removal of the fingers from the backbone. A slidably mounted actuator bar is provided in the backbone and has cam surfaces formed thereon for respectively opening and closing the fingers when the slide bar is moved between first and second positions. The cam surfaces respectively hold their associated fingers in opened or closed positions in accordance with the position of the slide bar.