HP C4951A Printhead features Jet express technology result in fast, unattended printing without compromising image quality. The 1" wide print heads with 512 nozzles per print head lay down a wider ink swath compared with 240 nozzles in the HP Design jet CP series ink systems. Maximum quality print modes up to 1200 dpi help bring high-resolution images to production printing. Designed for HP Design jet 5000, 5000PS, 5500, 5500PS Dye Print heads and Print head Cleaner, Indoor. HP-engineered to work as a modular ink system with HP 81 dye ink cartridges. Unrivaled print speeds, thanks to HP Jet express technology. Built-in smart chips monitor print head operation and alert you when it's time to replace. Yields 1,000 D size.