110 is a cartridge-based film format used in still photography. It was introduced by Kodak in 1972. 110 is essentially a miniaturized version of Kodak's earlier 126 film format. Each frame is 13 mm × 17 mm (0.51 in × 0.67 in), with one registration hole. Cartridges with 12, 20, or 24 frames are available on-line. Production variations sometimes have allowed for an additional image.
The film is fully housed in a plastic cartridge, which also registers the image when the film is advanced. There is a continuous backing paper, and the frame number is visible through a window at the rear of the cartridge. The film does not need to be rewound and is very simple to load and unload. The film is usually pre-exposed with frame lines and numbers, a feature intended to make it easier and more efficient for photo finishers to print.