The Brother MFC-4000ml laser toner from LD Products is a 100% brand new compatible laser toner that is Guaranteed to meet or exceed the print quality of the OEM Brother MFC-4000ml toner cartridge. Purchasing our Brother MFC-4000ml laser toner is an excellent way to save money without sacrificing quality. Our Brother MFC-4000ml laser toner cartridge has a '100% Satisfaction Guarantee'. The use of our compatible laser toner for the Brother MFC-4000ml does not void your printer's warranty. OEM (Original Equipment Manufacturer) laser toner cartridges are also available for your Brother MFC-4000ml.