Compatible with | HP models: LaserJet: 4250, 4250 Dtnsl, 4250 dtn, 4250 n, 4250 tn, 4350 Dtnsl, 4350 dtn, 4350 n, 4350 tn; Troy Systems models: 4250 Micr, 4250 Micr Secure, 4250 Micr Secure EX, 4250t Micr, 4250t Micr Secure, 4250t Micr Secure EX, 4350n Micr, 4350n Micr Secure, 4350n Micr Secure EX, 4350nt Micr, 4350nt Micr Secure, 4350nt Micr Secure EX |