The copier drum unit is composed of a drum and a series of other components that work together to transfer toner to the paper. The drum is a cylindrical component that is coated with a photosensitive material. As the drum rotates, an electrical charge is applied and the toner is transferred onto the paper. The drum is then cleaned and the process continues until the entire document is copied. The copier drum unit is designed to be durable and reliable and can last for several years depending on usage and maintenance.  It features a long-lasting, high-quality drum that ensures consistent performance and a sharp image quality. The cartridge is designed to be energy efficient, using up to 25% less toner than other similar cartridges.