With its rich black color, the HP 56/57 Black & Tri-color Combo Inkjet Cartridge works perfect for optimal printing of text, images, and graphics. This HP print cartridge is designed with special ink formula that it does not easily fade off over time. The HP C9321FN deskjet printer cartridge is compatible with various HP printers, including DJ5550, PS7350, PS1750, and PS7550. This inkjet print cartridge provides quality output in different kinds of media, including the plain paper and other types. This cartridge is well known for its exact replication of actual color of the image.