Features: If your printhead is 11 or C4810A, C4811A, C4812A, C4813A, you can buy this for your printer. If not, do not buy it. Compatible printer: For 11 1000 1100 1200 2200 2280 2600 2800 CP1700 100 500 9100 9120 K850. If your printhead is 11, our cartridge will be suitable for your printer. Note: Open the lid and remove the film before use. Specifications: Product model: Printhead For HP 11 (C4810A C4811A C4812A C4813A) Cartridge Color: Black, Cyan, Red, Yellow (optional) With Chip: Yes With Ink: Yes Compatible printer: For HP 11 1000 1100 1200 2200 2280 2600 2800 CP1700 100 500 9100 9120 K850 Package Includes: 1 Set x Printer Head with Ink 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 may leak. 2. Each 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, even if there is ink in the other print heads, the printer will not operate. 4. Once the new nozzle is installed, 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 become unusable. 6. Do not reach into the printer or 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.