Features:, If your original print head is 11 or C4810A, C4811A, C4812A, C4813A, you can buy this one for your printer. If not, don't buy. If you have any questions, please for consultation, thank you. Compatible printers: suitable for HP 11 1000 1100 1200 2200 2280 2600 2800 CP1700 100 500 9100 9120 K850. If your original printhead is 11, our cartridges will fit your printer. Specifications: Product model: Print head suitable for HP 11 (C4810A C4811A C4812A C4813A) Ink cartridge color: black, cyan, red, yellow (optional) With chip: yes Compatible printer: suitable for HP 11 1000 1100 1200 2200 2280 2600 2800 CP1700 100 500 910 0 9120 K850 Notes: 1. When installing a nozzle, you must remove the air hole seal according to the instructions, but do not remove other seals at will, otherwise ink will leak; 2. Every time a new nozzle is installed, the print head should generally be cleaned 3 -5 times (please clean the print head at least once); 3. When any print head has no ink or is not installed, the printer cannot work even if the other print heads have ink; 4. Once the new nozzle falls off, before replacing the nozzle It is best not to remove it; 5. Unless you want to replace the nozzle, do not open the nozzle protection clip, otherwise the nozzle may no longer be used; 6. Do not put your hands into the printer or touch the nozzle when the printer is working; first check the ink cartridge for some kind of Whether the color ink has been used up. Packing list: 1 x head printer Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.