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 mc350 mc360 c3520 3520 mfp 3530 3530 mfp printers appr