This pack contains five remanufactured cartridges three 350XL (CB336EE) black and two 351XL (CB338EE) colour cartridge. The 350XL black cartridge is physically larger than the 350 that typically come with printers but is fully compatible with any printers that take its low capacity counterpart.351XL colour remanufatured cartridges are the same size as the 351 but have much larger sponges on the inside and can take more ink as a result. Both of these remanufactured cartridges have been professionally refilled with a high quality dye based ink to give print quality on a par with the Hewlett Packard originals.