HP 507A (CE403A) Magenta Toner Cartridge for HP LaserJet Enterprise 500 551 570 575. HP 507A (CE400A) toner cartridges work with: HP LaserJet Enterprise 500, 551, 570, 575. Original HP toner cartridges produce an average of 71% more usable pages than non-HP cartridges. Cartridge yield (approx.): 6,000 pages. 507A toner is designed to work with your HP printer for high quality, reliable results every print. Ensure that your printing is right the first time and every time with HP printer toner: 507A toner. What’s in the box: 1 New Original HP 507A (CE403A) toner cartridge. Color: Magenta.