HP C4951A No 81 cyan Printhead for Designjet 5000. Page life - 1000. Combining a printhead with a printhead cleaner, you can make sure that your machine is working with the highest level of quality, providing crisp and clear prints. HP is an expert when it comes to printing and it uses this expertise to add the highest level of quality to all of its products. These printheads are designed for definition, working with exactitude to ensure that what you see on your monitor is exactly what you get on the page.