Yes, the suitable printer cartridges for the HP DeskJet 2820e are indeed the HP 305 and HP 305XL series.

- For black printing, you need the HP 305 or HP 305XL black ink cartridge.
- For colour printing, you need the HP 305 or HP 305XL 3-colour ink cartridge, which combines the colours cyan, magenta and yellow.

The XL variants offer a higher page yield and can save costs in the long term. Multipacks containing both the black and colour cartridges are also available.