This Jet Tec M21 is a remanufactured HP no.21 (C9351A) Black Ink Cartridge for use with :
HP Deskjet 3920, 3940, D1360, D1460, D1470, D2330, D2360, D2460, F370, F375, F380, F2100, F4180
HP Officejet 4315, 4355
HP PSC 1402, 1410, 1415, 1417, F2180

Jet Tec supply both compatible inkjet cartridges and remanufactured inkjet cartridges as well as refill kits for a wide variety of inkjet printers. Their cartridges have won many awards including the Queen's Award for Enterprise:Innovation 2004 for their patented Extralife technology which is exclusive to Jet Tec.