This is a professionally remanufactured replacement for the Dell M4640 high yield black ink cartridge. It has been remanufactured using both OEM and non-OEM parts and is guaranteed to work with your Dell printer. The cartridge has been thoroughly cleaned, inspected for any possible shell leakage, and tested for proper operation. It is designed to deliver a full yield, although ink levels may appear low due to printer programming. Backed by our 100% Quality Satisfaction Guarantee, this remanufactured cartridge is an economical alternative to OEM options.