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, Pro9000 Mark II How 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: The cartridges may not light up due to latest driver update. However, you will be able to continue to print and the ink levels will display