Feature: 1. Applicable Printer Model: The printhead is a replacement for HP Designjet 100 110 111 500 510 800 813 850, please check before ordering. 2. Advantage: The printhead for HP Designjet has clear resolution, strong layering, good compatibility and smooth printing. 3. Ink Color: The package includes four printheads, with ink color of Magenta(M), Black(K), Cyan(C) and Yellow(Y), with bright and clear color. 4. Stable and Reliable: Printhead for HP Designjet has stable performance and high reliability, suitable for replacing your broken parts. 5. Durable Material: Premium ABS material, lightweight, compact, non fading, high hardness, not easy to deformation. Specification: Item Type: PrintheadMaterial: ABSInk Color: Magenta(M), Black(K), Cyan(C) and Yellow(Y) .Applicable Printer Model: Replacement for HP Designjet 100 110 111 500 510 800 813 850 Package List: 4 x Printhead Note: If the printer is not compatible, there are generally the following reasons:1. The ink cartridge is not the original can not identify the print head, need to replace the ink cartridge.2. If the metal contacts of the ink cartridge or printhead are dirty, wipe the metal contacts of the ink cartridge and pen holder with a clean, soft cloth or an alcohol cotton ball to dry naturally and then insert them back for testing.3. If it is still not recognized, you can restore the printer to factory Settings and reset the print head.4. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.