This HP Q3964A drum unit has been remanufactured by trained professionals to a high standard. All worn parts have been replaced and tested with brand new ones giving you great quality prints when compared to the original HP Q3964A version but at the fraction of the cost.The drum units function is to hold the powder from your toner cartridge and then to lay your toner onto the page. This remanufactured Q3964A will give you the same page yield as the HP original version.This Q3964A drum unit is designed to go into a number of Hewlett Packard Laserjet printers a list can be found listed above. We are so confident in our products that every drum unit comes with a 100% satisfaction guarantee.All of our prices include VAT and delivery so that the price you see, is the price that you pay!