These printers use the IS56INK cartridge:

Neopost-Hasler IS 5000 A

Neopost-Hasler IS 5000 B

Neopost-Hasler IS 5000 C

Neopost-Hasler IS 6000 A

Neopost-Hasler IS 6000 B

Neopost-Hasler IS 6000 C