ColorTonerExpert compatible Dell M4640 ink cartridge is manufactured by expert technicians and is guaranteed to deliver the same printing performance and printing page yield of OEM (Original Equipment Manufacturer) Dell ink cartridge.This cartridge has undergone into several quality control tests to ensure that they will perfectly work with your inkjet printer and will not affect printing quality. Choosing this compatible Dell M4640 cartridge can also save you a lot money since it is offered at a much lower price compared to OEM Dell ink cartridges.