CAD designed and CNC machined from billet 6061-T6 and hard anodized for a long lasting finish. Directly replaces the factory main pulley. Built to the factory diameter as to not underdrive your accessories. Drive belt surface precision machined EXACTLY to specifications provided by OEM belt manufacturer to ensure long belt life. Timing notch identical to factory pulley. Weighs 1.2lbs, over 4lbs lighter than the factory pulley for improved engine acceleration. Comes in Blue and Gold