CIS (Continuous Ink System) for Canon Pixma MP640 printer that are used in PGI-220 (Black : Pigment base Ink) & CLI-221 (Black, Cyan, Magenta and Yellow : Dye base ink) cartridge No more Ink Cartridges purchase, No more Cartridges replacement. Pre-filled with 125ml x 1 color and 100ml x 4 colors = 525ml of premium UV Resistant Ink. Quick and Easy installation. You will be printing in minutes. 80% Saving on individual Inkjet Cartridge. Auto-reset chipsets automatically reset the cartridges so there is no need to utilize a chip resetter Refillable ink cartridges/ink reservoirs enable countless refills.