GREENCYCLE 10-Pack Compatible Toner Cartridge Replacement for HP 42X Q5942X 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 20,000 pages per Q5942X 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: LaserJet 4250 / 4250dtn / 4250dtnsl / 4250n / 4250tn / 4350 / 4350dtn / 4350dtnsl / 4350n / 4350tn 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.