Reman.
21 (C9351AN) Black Cartridge compatible with:
DeskJet 3910, 3915, 3918, 3920, 3930, 3930v, 3938, 3940, D1330, D1360, D2330, D2360, D2430, D2445, D2460, F300 All-in-One, F340, F380, F4180
Fax 1250
OfficeJet 4310
The use of compatible supplies does not void your printer warranty.