The HP 305 toner cartridges are compatible with a number of HP LaserJet Pro Color printers. Which printers are exactly covered by this is stated in the product texts of the toner cartridges. Please check this before purchasing your toner cartridges. This prevents you from having toners that don't fit or don't work with your printer. The 305 toner series consists of original HP toner cartridges or toner cartridges by the private label Pixeljet. They're available as individual toner cartridges or Combo Packs, so you never buy too much or too little.