Ross Performance Parts Nissan RB30 (Australia) Gold Series Harmonic Damper with Integrated 12 Tooth Trigger Disc:

Top tier harmonic damping
Rated for 1,000+hp
Ultra high-performance crank hub
Integrated 12 Tooth Trigger
Water pump & Alternator pulley’s under-driven for protection at high rpm

Note: Race Series and Gold Series do not have provision for crank driven air conditioning. A/C Relocation Kit available.