4inkjets.com's compatible Brother DR520 laser drum unit is guaranteed to perform with your Brother laser printer. It replaces the original Brother DR520 laser drum unit. The compatible replacement DR520 laser toner cartridges and supplies (also known as generic) are specially engineered to meet the highest standards of quality, reliability and exceptional yields that meet or exceed OEM (Original Equipment Manufacturer) standards for the DR520 and offer high-quality printing results. Manufactured with brand new parts, they are an economical alternative to expensive OEM DR520 Brother laser drum units and supplies, and offer big savings over brand-name DR520 laser drum unit and supplies. The use of compatible replacement laser toner cartridges and supplies does not void your printer's guarantee. We offer a 100% Quality Satisfaction Guarantee on our compatible DR520 laser toner cartridges and supplies.