The HP 11 Magenta Ink C4837A is a genuine OEM product manufactured by HP in Singapore. It is compatible with HP DesignJet 500 and 800 printers and provides high-quality prints with its inkjet print technology. With an expiration date of October 2021, this sealed unit ensures long-lasting usage and reliable performance for your printing needs. The vibrant magenta color will make your documents and images pop, making it a valuable addition to your printer supplies.