The GUSTEC 42A (Q5942A) Black Compatible Toner is designed to provide exceptional quality and reliable performance for HP LaserJet 4240, 4250, and 4350 printers. This high-yield toner cartridge delivers approximately 10,000 pages at 5% coverage, making it ideal for high-volume printing environments. Gustec toner cartridges outperform non-HP alternatives, producing up to 71% more usable pages, ensuring better value and longer-lasting results. With precision engineering, this toner guarantees consistent, sharp black prints for every job.