These original CLI-42GY ink cartridges have been designed and manufactured to be used specifically with the Canon Canon Pixma Pro-100 printer. Carrying enough grey ink to give an estimated 492 photos the Canon CLI42GY is a cost effective way to run your Canon printer. The 13ml of dye-based ink inside the Canon 6390B001 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.