GREENCYCLE 6-Pack Compatible Toner Cartridge Replacement for HP 37A CF237A Toner (Black). Stability and Reliability: The chip has powerful computing and processing capabilities to perform efficiently. It is stable, reliable and functionally depleted to ensure normal operation in a variety of environmental conditions. Page Yield: Up to 11,000 pages per CF237A toner cartridge (based on 5% coverage of Letter size Paper) Actual toner yield varies with usage, graphics printed and environmental conditions. Compatible for HP Printer: Enterprise M607 M607n M607dn / M608 M608n M608dn M608x / M609 M609x M609dn / MFP M631h M631z M631dn / MFP M632z M632h M632fht M633fh M633z Printer. Our cartridges are made of quality materials: smart chip, toner powder, smooth OPC & roller and industrial grade packaging. Make your presentations and printouts stand out with GREENCYCLE toner cartridge that produces clear, crisp, bold, and eye-catching text and graphics that keep people awake at your next meeting.