This remanufactured HP black 51640A cartridge is a high quality cartridge and represents a significant saving on the original HP 51640A cartridge. The HP 40 Black cartridge is compatible with a wide range of HP printers and offers comparable quality to the original HP 51640A black cartridge.Our remanufactured black HP 51640A cartridges for this range of HP printers are amongst the lowest priced on the internet and carry a 100% satisfaction guarantee. All our prices include VAT and delivery so the price you see is the price you pay.