Canon CLI-521 ink cartridge grey for use in iP3600, iP4600, MP54, MP620, MP630 and MP980 printers. OEM: 2937B001. Add depth and complexity to photos and images with a Canon Grey 521 Inkjet Cartridge for PIXMA printers. Each Canon CLI-521GY cartridge uses Canon FINE (Full Photolithographic Inkjet Nozzle Engineering) print heads for incredible crispness and detail. These printheads, combined with uniquely formulated Canon ink, provide exceptionally long-lasting prints under the Canon ChromaLife 100 system. The efficient design delivers a whopping 1,370 pages.