Working in perfect harmony with your machine, the HP No. 504A Black LaserJet Toner Catridge is the ideal way to ensure that all of your prints are finished with the best level of quality. Lines are kept sharp and clear, making text easily legible and shades are distinct, making photographic quality attainable. Printing with exceptional speed, this cartridge is designed not to make mistakes during the printing process, ensuring that there is never any blemish or blot on your page.