Clean your compatible hp design jet thoroughly with this hp 91 maintenance cartridge it fits into your hp designjet printer to help you clean the inkjet nozzles efficiently to improve overall device functioning because it39s a genuine hp product it helps to assure trouble free printing and it39s ideal for use before heavy print jobs that need to be right first time when you39re done with this hp 91 maintenance cartridge take it out and reuse it again and again scroll down th