The genuine HP 660A imaging drum has been produced by the makers of your printer, meaning there is no other alternative built with equal precision or compatibility to your machine. Whilst some Hewlett Packard laser printers have drums built into their toner cartridges, the W2004A comes as a separate unit, allowing you to change it whenever necessary.With an estimated page yield of 65,000 prints, this original Hewlett Packard 660A drum unit keeps the running costs of your printer low, as it rarely needs replacing. The Hewlett Packard W2004A is essential for the ongoing use of your printer and is a purchase that you will not regret.