Seller notes

GO FAST BITS Lightened Underdrive Alternator Pulley GFB Lightweight Pulleys For BRZ/FR-S/86 Like all GFB lightweight pulleys, these begin life as a single 6061-T6 aluminium alloy billet, which is then precision CNC machined to exacting tolerances. We then anodize them black for a stealthy appearance and superior wear resistance. The weight doesn’t tell the whole story either - even though the saving is a significant 77%, the actual rotating inertia reduction (inertia is what counts) is 83%.......

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