1,Easy to refill! 2,Never run out ink! 3,SAVE 90% ON INKJET COST 4,Durable 5,No need modification printer This is Empty XL size refillable ink cartridge for use on HP designjet 5000,5500 Z6100 inkjet printerAbout HYD brands refill ink cartridge HP5000 HP5500 HPZ6100 These are a see through cartridge that very easily refilled through the refill hole on the top of the cartridge. Simply remove the ...