Optimize your 4AGE engine's rotational speed with a lightweight Fidanza Aluminum Flywheels made in the USA. These are made using the highest quality, most modern materials available. The flywheel itself is made from 6061 T6 billet aluminum. CNC machined with a replaceable friction surface using 1050 high carbon alloy steel. It is incredibly durable, allowing the user to use just about any clutch disc material available. The plates are secured with 16-20 hardened aircraft quality screws with self locking nuts which prevent any warping. Fidanza uses hardened ring gears that are swarted to the flywheel with button head screws that are counter board between the flywheel and ring gear to prevent any possible slippage. The mass at the center of the flywheel is retained for strength, but the mass at the outside is eliminated for optimum performance.