Alotpower Replacement Spindle End Cap Hub for HP DesignJet 500 800 C7769-40169 C7769-40153 series (blue + black) Spindle End Cap Hub Campatible with HP DesignJet 500 800 Each unit is tested before shipping Notice:We are not responsible for any damage caused during installation. All pictures are taken from the real item, please check carefully before bidding