HP 51640A No 45. Inkjet Print Cartridge Black 42ml. To fit Deskjet 1200C/PS/Copyjet/ Copyjet M/Designjet 230/ 250C/330/350C/430/450C/455CA/488CA/650C/650CPS. 1100 page life. Giving you the very best level of results, the HP No. 40 Black Inkjet Cartridge is ideal for ensuring that all of your images are finished with the highest definition. Fitting into your printer with the least possible difficulty, nobody will have any trouble installing the cartridge into your device. This cartridge is designed to work quickly but without creating any of the mistakes that are associated with haste.