Moving Irons principle: Unlike the MM principle, there is no permanent magnet on the needle carrier, which moves directly between the coils, but indirectly a small, lighter iron tube within a magnetic field.
Other models of the same series:
AKG P 6 E
AKG P 6 R
AKG P 7 E
AKG P 8 E
AKG P 8 ES
AKG P 8 ES Super Nova (needle with Van den Hul II cut)