The Original Lexmark 12N0772 (0012N0772) Tri-Colour Imaging Drum Unit is vital for maintaining the high quality prints you have come to expect from Genuine Lexmark supplies. The purpose of the Genuine 0012N0772 Drum Unit is to take Toner powder from the Cartridge, then to accurately place the Toner onto the page.The Original Lexmark 12N0772 Tri-Colour Imaging Drum Unit comes with an oil coating roller for more consistent, long lasting print results, making its reliability ideal for use in the busy office. The Genuine 0012N0772 is designed to be changed after roughly 28,000 pages (based on a 5% coverage) and is compatible with a variety of Lexmark Printers.