Inkjetcorner inkjet cartridges for your printers are built to meet the same original specifications and performance standards as the OEM cartridges. Compatible with the following printers: Pro9000 Mark IIHow to install / replace new ink cartridge: Step 1: Pull off tape (if any) the yellow/clear sealing tape on top of the cartridge. If there are no tape on the top, proceed to Step 2Step 2: Turn cartridge upside down and remove the orange cap/bracket off the cartridge Step 3: Insert the cartridge into the corresponding slot and push down on the cartridge until you hear a click sound Step 4: This Step is optional. Run a Printhead clean on the cartridge. this will flush out residue leftover from previous use NOTE: Due to printer drivers update, the LED lights may or may not light up for the compatible cartridges. however, you will be able to continue to print and the ink levels will display