You are bidding on one 256MB memory module for HP Color LaserJet printers. Please refer to a list of the compatible printers below,

p/n: Q2631A, KTH-LJ4650/256 One 256MB module Compatible with Hewlett Packard Color LaserJet 4650, 4650 (Q3668A), 4650n (Q3669A), 4650dn (Q3670A), 4650dtn (Q3671A), 4650hdn (Q3672A), 5550, 5550dn, 5550dtn, 5550hdn, 5550n.