HP Laserjet 640A  Yellow Toner in Retail Packaging (C4194A)
Genuine HP LaserJet printing supplies are always the right choice. They deliver exceptional print quality and hassle-free operation, page after page, because they're specifically designed to work with HP printers. Did you know that 70% of a LaserJet printer's imaging system is based on HP's LaserJet print cartridges? The technology of the print cartridge is any printing system's most critical component, so if you're not using HP supplies, you're not getting HP printing. With genuine HP LaserJet printing supplies, you also know you're getting the best total cost of ownership because HP factors in qualities like reliability, dependability, and ease of use.