Stop overpaying for expensive brand-name drums and try a Premium® Compatible Drum which comes with a 100% guarantee. A laser printer's drum is a cylinder that is electrically charged and is responsible for transferring toner onto paper via heat and pressure. It is imperative that this consumable be constructed using OEM-equivalent parts, including a 100% warranty, and is SMTC, CE, ISO9001, and ISO14001 certified, which all of our compatible products are.