XPRO series Dye Ink CISS for HP Officejet Pro 8600 8100 printers Continuous Ink System NEW XPRO Bulk Continuous Ink System (CIS) for:HP Officejet Pro 8600 8100 printers Pre-filled with 400ml of premium DYE Ink, Guarantee no clog Quick and Easy installation, you will be printing in minutes Auto-reset chipsets reset the cartridges so there is no need to utilize a chip resetter nor take the cartridges out of the printer to refill Best quality, fast shipping, best service