This CB385A Hewlett Packard drum unit has been engineered from the ground up to work flawlessly with the ColorSphere toner contained within the drums counterpart toner cartridge. This CB385A imaging drum distributes the ColorSphere toner particles in the evenly across your prints resulting in coloured prints with a smooth transition between colours and without visible gaps in solid printing.The CB385A and other genuine Hewlett Packard imaging drum units give high gloss results and are capable of printing consistently even at higher speeds in your HP printer.