If your original printhead is 11 or C4810A, C4811A, C4812A, C4813A, you can buy this for your printer. If not, Do not buy it. Any questions, please contact us for advice, thank you! Compatible printer:For HP 11 1000 1100 1200 2200 2280 2600 2800 CP1700 100 9100 9120 K850. If your original printhead is 11,our cartridge will suitable with your printer. Specifications: Product model:Printhead For HP 11(C4810A C4811A C4812A C4813A) Cartridge Color : Black, Cyan, Red, Yellow (optional) With Chip: Yes With Yes Compatible printer: For HP 11 1000 1100 1200 2200 2280 2600 2800 CP1700 100 9100 9120 K850 Package Includes: 1Set x Printer Head with 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 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 or is not installed, even if there is 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 of a certain color in the cartridge has been used up.