Hewlett Packard Original "OEM" HICAP Q3961A CYAN Smart High Capacity Print Laser Toner for HP Color LaserJet 2550 series and 2550n, 2550Ln, 2550L,2840......also see:Q3960A,Q3961A,Q3962A,Q3963A,Q3964A,
What is OEM? OEM means Original Equipment Manufacturer, in other words it's a genuine toner, inkjet, or ribbon directly made by its manufacturer and labeled by the manufacturer.
 "Q3961A HiCap Cyan")