The 937 BK should be used by anyone looking for better defined colours, especially blacks. This black cartridge gives the deepest blacks necessary to make the contrast between the paper and the ink as distinct as possible, so that every letter, line, and image is clear and separate from the rest. This high quality HP 953XL black compatible inkjet cartridge was engineered in a manufacturing facility that uses state of the art processes to insure that this cartridge will be 100% compatible to your printer and will print as well as the original.