Hp 55X (CE255X) Black High Yield Original Toner Cartridge. Hp 55X (CE255X) toner cartridges work with: Hp LaserJet Enterprise 525, P3015. Hp LaserJet Pro M521. Save up to 25% with high-yield Hp toner. Cartridge yield (approximately): 12,500 pages. Original Hp toner cartridges are specially designed to work with your printer to consistently deliver standout results throughout the life of your cartridge. Ensure that your printing is right the first time and every time with Hp printer toner: 55X toner.