HP 503A (Q7583A) Magenta Original Toner Cartridge HP 503A (Q7583A) toner cartridges work with: HP Color LaserJet 3800, CP3505. Original HP toner cartridges produce an average of 71% more usable pages than non-HP cartridges. Cartridge yield (approx.): 6,000 pages 503A toner is designed to work with your HP printer for high quality, reliable results every print. What's in the Box: New Original HP 503A (Q7583A) toner cartridge. Color: Magenta