Gestetner C7531DN Laser printers require new toner cartridges from time to time. GMS stocks Gestetner C7531DN hi yield genuine toner cartridges. A full cartridge change requires a black, cyan, yellow and magenta. GMS offers a complete toner set at a discounted price to buying each one individually. Free Ups Ground shipping on all order over $50.00, place your order online today or call GMS 800-537-1005 today.