New Compatible Drum
Drums used in disposable cartridges are OPC or "Organic Photo Conductors" that refer to the type of chemicals used to coat the aluminum tube that is the drum base. All drums are light sensitive. There are normally three different layers of chemicals used to make the drum. The first is an insulator, the second is the reactive layer that reacts to light, and the third is a protective layer. It is this protective layer that determines how long a drum will last. The most common cartridge failure is due to the drum. The drum has the wiper blade scraping any excess toner off it as well as paper rubbing against it as it prints.