The fuser unit in your printer fuses toner to paper using heat. After years of use it can become worn, reducing the quality of your prints. If this is the case with your printer, make sure to replace it with this HP LaserJet fuser kit. Genuine HP products will guarantee the same quality that you have received from your printer to date and will last for as long as the original fuser did. Suitable for use with HP LaserJet 4250 and 4350 printers, the fuser kit is simple to install and hassle-free.