This is a genuine Premium Compatibles Inc. / PCI Brand® quality replacement cartridge that replaces your used Brother DR520 drum unit. Our PCI Brother DR520 black drum unit gives you 25000 pages average at 5% print coverage and is 100% guaranteed to perform with your printer. The PCI Brother DR520 drum unit replaces your original Brother drum unit exactly . PCI is a proud USA owned and operated corporation. We combine precision manufacturing with rigorous multi-layer quality control procedures to provide you with a Brother DR520 drum unit replacement you can rely on. Our PCI Brother DR520 black drum unit replacement is manufactured to the highest standards and all our products come backed with our Premium Promise™ factory direct 1-year warranty .PCI DR520PC brings you superior savings over Brother DR520 and delivers proven print quality and customer satisfaction. Relax and enjoy the savings knowing that use of this PCI Brand® Brother DR520 drum unit will not void your printer warranty. The PCI Brother drum unit is engineered to be fully compliant with your printer's software and will work flawlessly with managed print software.