These original CLI-42M ink cartridges have been designed and manufactured to be used specifically with the Canon Canon Pixma Pro-100 printer. Carrying enough magenta ink to give an estimated 416 photos the Canon CLI42M is a cost effective way to run your Canon printer. The 13ml of dye-based ink inside the Canon CLI-42M cartridge comes with ChromaLife100+ technology making it resistant to UV light, temperature, humidity and even gases that detrimental to the long life of your prints.