This 14N1921E Return Program Pack Contains: high capacity black ink cartridge - 510 pages high capacity cyan ink cartridge - 600 pages high capacity magenta ink cartridge - 600 pages high capacity yellow ink cartridge - 600 pages Lexmark 100XL High Capacity Black Ink Cartridge (Return Program 14N1068E) 510 Pages Lexmark 100XL High Capacity Cyan Ink Cartridge (Return Program 14N1069E) 600 Pages Lexmark 100XL High Capacity Magenta Ink Cartridge (Return Program 14N1070E) 600 Pages Lexmark 100XL High Capacity Yellow Ink Cartridge (Return Program 14N1071E) 600 Pages These are Lexmark Return Program Cartridges. Lexmark give you an upfront discount on their return program 100xl ink cartridges on the basis that you return the 100XL ink cartridges to them when it is empty, only if you want to. They will provide you with a freepost bag to return this Lexmark 100xl ink cartridge value (14N1921E). This means you get a discount compared to buying the regular priced cartridge but you get exactly the same cartridge. This is Lexmark's way of recycling.