Original HP Toner Cartridge | PREMIUM PERFORMANCE - Rely on Original HP Cartridges to deliver consistent results | THE ENVIRONMENTAL CHOICE - Cartridges designed with the planet in mind for easy recycling | | SPECIFICATIONS | Compatible with the following: HP NEVERSTOP LASER 1001NW | 20,000 pages (estimated page yield provided based on 5% coverage or at ISO 2471 pattern/normal) | Type: Imaging Drum | OEM: W1144A