Our discount compatible Panasonic KX-FL501 toner cartridges will print with the same consistency and reliability as your original Panasonic printer cartridge. To ensure the best printing experience, we engineer our toner cartridges based on the specifications of your original Panasonic cartridges. To certify that these discount toner cartridges for Panasonic KX-FL501 printers perform up to industry standards for excellence, we test every cartridge before shipment. All products include a full 1-Year warranty and 100% customer satisfaction guarantee. We also provide lifetime customer support, thus providing our customers with complete peace of mind.