All of Toner Refill Store's premium compatible Canon toner cartridges contain brand new parts and are 100% guaranteed to meet or exceed your expections and surpass the print quality of the OEM (Original Equipment Manufacturer) Canon CFX-L4000. Our Canon CFX-L4000 toner cartridges are made from the highest quality materials. Our Canon CFX-L4000 high yield laser toner cartridge have a 'One Year 100% Satisfaction Guarantee'. The use of our premium compatible laser toner cartridges for the Canon CFX-L4000 does not void your printer's warranty.