Produce the best possible results for your printer by using a genuine HP No.504X Black LaserJet Toner Cartridge. Compatible with the HP LaserJet CP3525 and CM3530, the 504X cartridge will produce professionally stunning black and white prints with accuracy guaranteed. The high capacity cartridge is easy to install and replace, and will last for up to 10,500 printed pages before needing replacement. Buy a twin pack to increase productivity further and decrease downtime.