This is one full color set of MTI © PRO Laser Toner Cartridges (Black, Yellow, Cyan, Magenta) for use in Ricoh Aficio C3500, C3500EFI, C3500SPF, C4500, C4500EFI, C4500SPF Printers. MTI © PRO products produce rich colors and crisp detail for impressive printing results page after page. MTI PRO cartridges are engineered for businesses and professional printing demands to maximize your efficiency, increase performance and help manage your costs. MTI compatible color cartridges are ISO 9001 certified, ensuring that page yield and print quality match OEM standards. We offer an exclusive 30-day customer satisfaction guarantee and 2-year Manufacturer Warranty. Our dedicated customer care staff is available 9 a.m. to 7 p.m, Monday through Saturday, to answer any questions and provide technical support.