Compatible Black Panasonic Toner Cartridge KX-FA83 (2,500 Page Yield) for Panasonic KX-FL511, Panasonic KX-FL541, Panasonic KX-FL611, Panasonic KX-FLM651 Toner cartridges are compatible toner cartridges (non OEM). Toner cartridges are all professionally tested thoroughly before they are shipped. Toner cartridges are manufactured with new components, new toner, and air-sealed in an ISO-9001 / ISO-14001 quality certified factory.