We offer LD remanufactured cartridges as well as original Hewlett Packard cartridges for your HP LaserJet 5si printer. LD remanufactured replacement laser toner cartridges and supplies for your HP LaserJet 5si are specially engineered to meet the highest standards of quality and reliability. Using our LD laser toners for your HP LaserJet 5si printer will not void the printer warranty. All of our products come with a Two Year 100% Quality Satisfaction Guarantee. We also carry original Hewlett Packard laser cartridges which offer the quality that you can expect from HP and are backed by the standard HP warranty.