HP 55A (CE255A) Black Original Toner Cartridge for HP LaserJet Enterprise 525 P3015 HP LaserJet Pro M521 HP 55A (CE255A) toner cartridges work with: HP LaserJet Enterprise 525, P3015. HP LaserJet Pro M521. Original HP toner cartridges produce an average of 71% more usable pages than non-HP cartridges. Cartridge yield (approx.): 6,000 pages Cartridge yield (approx.): 6,000 pages 55A toner is designed to work with your HP printer for high quality, reliable results every print. What's in the box: New Original HP 55A (CE255A) toner cartridge Color: Black NEVER SHOP FOR TONER AGAIN - With Amazon Dash Replenishment, your printer tracks your usage and automatically reorders the HP Genuine toner cartridges you need, only when you need them.