Designed for exact compatibility with oki products only oki consumables ensure maximum performance longevity and ultimate cost effectiveness okis 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 for use with oki c9000 c9200 c9400 printers approx 15 000 pages magenta