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    - Eliminates torsional crankshaft vibrations

    - Exceeds SFI 18.1 specs

    - Laser engraved-etched timing marks

    - Black zinc chromate finished

    Inner and outer shells are available in aluminum or steel contain the steel inertia weight. The inertia weight has six (2-ring design) or eight (3-ring design) computer machined grooves to retain the proper durometer O-rings (dyno tested for each application).