Install a Canon 521 Inkjet Cartridge in your PIXMA inkjet printer to enjoy high quality documents and photo prints. Each Canon CLI-521BK cartridge uses Canon FINE (Full Photolithographic Inkjet Nozzle Engineering) print heads for incredible crispness and detail. These printheads, combined with uniquely formulated Canon black ink, provide exceptionally long-lasting prints under the Canon ChromaLife 100 system and are capable of producing 815 photos.