10 Water / Chemical Filter Cartridges. All filters are individually wrapped in plastic. The dimensions are approximately 4-3/4 high, the outer dimension is 2-1/2 and the inner opening is 1-1/16. We used the filters in a Colenta Mini Hanger Film Processor. I sold the machine along with the manual, the box the filters were in had no information, so I can't tell you any more. I have listed a box of ten, but I do have 38 filters if you should need more.