Canon LBP-840

HP 29X High Yield Black Original LaserJet Toner Cartridge (C4129X)
High-capacity cartridge means a lower cost per page. HP LaserJet print cartridges with Ultraprecise technology use dual polymer toner particles, helical roller drive, and magnetic seals to deliver optimum quality printouts. This higher yield cartridge also provides customers with a low overall cost of ownership. Device Types: Laser Printer; OEM/Compatible: OEM; Page-Yield: 10000; Supply Type: Toner.

HP C4129X (HP 29X) High Capacity Black Toner Cartridge
C4129X High Capacity Black Toner Cartridge compatible with the HP LaserJet 5000/ 5100. Yield 10000 Pages @ 5%

HP C4129X (HP 29A) High Capacity Black MICR Toner Cartridge
C4129X High Capacity Black MICR Toner Cartridge compatible with the HP LaserJet 5000. Yield 10000 Pages @ 5%