Designed for a wide compatibility range, this 10set Developer Unit Gear fits models including 700, 700i, 770, 550, 560, 570, C70, C75, J75, 7780, 5151, 7171, and DC240.Crafted for reliability, each gear ensures performance for your printers, enhancing print quality and consistency across a variety of documents.Engineered with, these developer units feature construction to withstand rigorous daily use, making them suitable for both office and commercial environments.Easy to install, these units