The Canon GPR-61 High Yield Complete Toner Cartridge Set is a genuine Canon product designed for use with the Canon imageRUNNER ADVANCE DX C5840i printer. This set includes four colors - cyan, yellow, magenta, and black - with high page yields of 71,000 pages for black and 60,000 pages for each color. The cartridges are compatible with the specified printer model and are sold as a complete set by the seller windycitytoners, making it convenient for users to replace all colors at once.