①. Material: Premium 952 printhead housing is made of ABS, which is abrasion resistant and has undergone multiple tests to ensure printhead performance and help keep the printer running smoothly. ②. Compatible Models: Compatible with HP OfficeJet 7740, 7730, 7720, 8210, 8710, 8730, 8740, 8216, 8720, and 8725. ③. High Performance: Equipped with an upgraded 952 print head chip, it can identify ink cartridges more quickly, ensuring smooth ink jet from the print head, protecting the printer, and producing clear, bright-colored prints to add color to life. ④. Easy Installation: This printhead kit includes only one printhead; no other accessories or extra tools are required. Simply push the printhead to complete the installation, saving time. ⑤. Note: Be careful when installing the nozzle and ensure the power is cut off before handling. ⑥. Specification: Item Type: Print Head; Product Material: ABS; Applicable: For HP OfficeJet Pro 7740, 7730, 7720, 8210, 8710, 8730, 8740, 8216, 8720, 8725. ⑦. Package List: 1 x Print Head ⑧. Note: Solution for incompatibility: Reset the printer by following these steps. Turn on the printer (if not already on). Wait for the printer to come to a complete standstill before continuing. After turning on the printer, disconnect the power cord from the back of the printer and unplug it from the wall outlet. Wait at least 60 seconds. Plug the power cord back into the wall outlet (HP recommends plugging it directly into a wall outlet). Reconnect the power cord to the back of the printer. Turn on the printer (if not already on automatically). The printer may take time to warm up, with lights possibly blinking and the carriage moving. Wait for it to warm up and come to a complete standstill before proceeding. If the above methods do not resolve the compatibility issue, replace the original ink cartridge and ink.