Genuine HP LaserJet toner cartridges give crisp, black text and graphics. The microfine toner cartridge takes full advantage of a compatible printer's smaller-dot 600-dpi resolution and HP's resolution enhancement technology. High-detail graphics print with clean, more precise edges. Finer toner particles offer more even coverage. Designed for use in HP LaserJet 4L, 4ML, 4P and 4MP. Yields 3,350 pages.