Maintenance kits are the most convenient and economical way to maintain and repair your HP LaserJet line of printers. Each kit contains the parts most commonly used to repair and rebuild HP LaserJet printers at considerable savings off their individual purchase price. Whatever the size of your business, regular use of HP LaserJet Printer Maintenance Kits helps to maximize laser printer performance and eliminate repeat service calls. A maintenance kit is preventative medicine for your laser printer. Through extensive testing, HP engineers have identified laser printer parts that experience similar wear patterns over time. These parts - used by HP service personnel to repair printers like yours - are the same parts contained in your maintenance kit. The kit contains a fuser (110V), a transfer roller and feed/separation rollers.