Amazon.com: OKI Toner Set for C610 Series Printers. Full Set of 4 Genuine OKI Toner Cartridges. 44315301 Yellow, 44315302 Magenta, 44315303 Cyan, 44315304 Black. Type C15 - 6K Yield on colors, 8K
45488801 Black Toner Cartridge OKI B721 B721dn B731 B731dn 18 Print Cartridge - Sun Data Supply