Product name: Compatibility Hp printhead replacement Color: Black, Cyan, Magenta, Yellow Package quantity: 1 pcs 950/951 printhead. Material: ABS Applicable printer:This Printhead Applicable with HP OfficeJet Pro 8600, 8600 Plus, 8610, 8615, 8620, 8625, 8630, 8640, 8660 HP OfficeJet Pro 251dw, HP OfficeJet Pro 276dw Install: 1, Remove the blue color protection cover and White rubber plug. 2, Open the printer Inspection cover, And wait for the carriage of the printhead to move to the left to stop, removing the printhead. 3, Clean the residual ink on the frame to Avoid printer error(This is important). 4, Please don't touch the contact of the printhead chip with your fingers to avoid reporting errors. 5, Push the printhead into your printer, after installing the printhead, pulled down and clamped tightly to avoid looseness.