Features: Brand new and high quality Experience smooth and stable printing with print heads for HP91 series. Perfect replacement for your printer, ensuring natural colors and flawless nozzle performance. Crafted with polished nozzles and paper jam free design, these print heads guarantee a seamless printing process. Designed for professionals and individuals who value print quality, these print heads are ideal for graphic designers, photographers, and office users. Whether you're printing important documents, stunning photographs, or creative designs, these print heads deliver exceptional results every time. Upgrade your printing experience with these reliable and cost effective print heads. Say goodbye to expensive replacements and enjoy high quality prints without breaking the bank. Specifications: Product model: Printheed For HP 91 Cartridge Color: Black Gray, Black Blue, Red Yellow, Red Blue (optional) Compatible printer: For HP Designjet Z6100 42-in (Q6651C) For HP Designjet Z6100 60-in (Q6652C) For HP Designjet Z6100ps 42-in (Q6653A) For HP Designjet Z6100ps 42-in (Q6653C) For HP Designjet Z6100ps 60-in (Q6654A) For HP Designjet Z6100ps 60-in (Q6654C) Package Includes: 1 x Printer Head note: 1. When installing the nozzle, you must remove the air hole seal according to the instructions, but do not remove other seals at will, otherwise the ink will leak; 2. Each for time a new nozzle is installed, the print for head should generally be cleaned 3-5 times (please wash the print for head at least once); 3. When any print for head has no ink or is not installed, even if there is ink in the other print heads, the photo machine will not work; 4. Once the new nozzle is off, it is best not to remove it before replacing the nozzle; 5. Unless you want to replace the nozzle, do not open the nozzle protective clip, otherwise the nozzle may no longer be used; 6. Do not reach into the printer or for touch the nozzle when the printer is working; first check whether the ink of a certain color in the ink cartridge has been used up.