This Genuine HP Toner 645A Set includes cyan, magenta, yellow, and black cartridges, compatible with HP printers. The set is designed for laser print technology and comes with UPC numbers for each box. The cartridges are of standard size and require no special handling. The California Prop 65 Warning applies to this set, so be sure to research it thoroughly. This Genuine/Original HP Toner set is perfect for those who want high-quality prints and reliable performance. Get your hands on this unit today and enjoy consistent results with your HP printer.