Designed for exact compatibility with OKI products, only OKI consumables ensure maximum performance, longevity and ultimate cost-effectiveness. OKI's ribbon cassettes, inkjet heads, toner and EP cartridges and other consumables are an integral part of the fundamental design of its printer and fax products, combining with other key elements of their design to deliver optimum durability, reliability and print quality.PRODUCT FEATURES:Separate image drum for lower running costs;Image drum and toner cartridge for each color;Configuration assists high-speed, single pass printing;Designed specifically for use with Oki's color printers;30, 000 pages A4 average life, based on a typical office environment.