HP Toner Cartridge 641A. HP Black Toner Cartridge 641A. Genuine Brand HP Toner. HP Color LaserJet 4600 Black Print Laser Cartridge # C9720A (HP 641A toner). Fits HP Color LaserJet 4600, 4600dtn, 4600hdn, 4600n, 4610n, 4650, 4650dn, 4650n, 4650hdn. HP smart printing supplies are designed to work together with the HP LaserJet 4600 Series printers as a system for output thatís always clear, always sharp. Also for the Canon Imageclass C2500, LBP2510, LBP5500 (EP85BK). Yield = 9,000 copies.