1Compatible models: The print head is compatible with HP Photosmart for B110a for B209a for B210a for B110b for B110c for B110d printers 2ABS shell: The ABS shell of the print head is more durable and has been tested many times to ensure the performance of the print head and make your printer work smoothly. There may be a small amount of ink left on the product, which is normal 3Easy installation: The print head can be installed and used without any accessories and disassembly, without damaging the original machine. Be careful when installing the nozzle, be sure to turn off the power before putting it away 4High performance: The print head chip can identify ink cartridges faster, the print head ejects smoothly, protects the printer, and prints clearly and brightly 5Function test: The print head test is carried out before leaving the factory to ensure the performance of each set of accessories. Manual assembly of machine testing ensures high performance of products