This is one full color set of MTI © Compatible Laser Toner Cartridges (Black, Yellow, Cyan, Magenta) for use in Savin C-3535, C4540 Printers. MTI © toner cartridges are engineered to exceed industry standards of high yield and exceptional quality, and guaranteed to perform with Savin Printers. Every cartridge is engineered in an ISO-certified facility and factory tested before shipping. 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.