Compatible with multiple models including 450i, 550i, 650i, 750i, 451i, 551i, 651i, and 751i for versatile use across various printer setups. Yield design supports up to 260, 000 pages, allowing extended use before replacement. DR-618K Kit includes all necessary components for a complete drum unit rebuild. Engineered for function and consistent print quality over long-term use. Easy to install with straightforward steps designed for user-friendly maintenance.