Genuine HP 51626ae black ink cartridge (no.26) 40ml for use in the HP deskjet plus, 400, 400l, 420c, 500, 500c, 510, 520, 540, 550c, 560c. HP deskwriter c, 520, 540, 550c, 560c. HP designjet 200, 220, 600. HP officejet lx, 350c. HP fax 300 / 900 series & APOLLO P-1200, P-1220.