HP 42A (Q5942A) Black Original Toner Cartridge HP 42A toner cartridges work with: HP LaserJet 4240, 4250, 4350. Original HP toner cartridges produce an average of 71% more usable pages than non-HP cartridges. Cartridge yield (approx.): 10,000 pages 42A toner is designed to work with your HP printer for high quality, reliable results every print. What's in the Box: New Original HP toner cartridge Color: Black