OEM-Genuine HP C9451A LIGHT-GREY INKJET 70, #70,FOR: DESIGNJET Z2100,Z3100. 130 ml. What is an OEM? OEM definition: Original Equipment Manufacturer OEM-Genuine HP C9451A is manufactured by Hewlett Packard and is completely brand new. When buying OEM products, you can rest assure that your Hewlett Packard Inkjet Cartridge will generate quality printing. The cost for OEM inkjet cartridges are overall more expensive, but the print quality is better and longer lasting. Think Toner offers all inkjet cartridge toners at every day low prices. Enjoy your OEM-Genuine HP C9451A.