This offer includes a Premium Replacement Drum Unit. These cartridges are designed for use with E250, E250DN, E350, E352, E450, 1612 Express, 1622 Express Models printers. These cartridges are professionally manufactured to provide reliable performance and high-quality prints. Additionally, the use of these replacement toner cartridges does not void your printer's warranty. We also offer free and fast shipping on all domestic orders. If you are not completely satisfied with your purchase, you can return your order within 30 days for a full refund or free replacement.