FIDANZA Lightweight Flywheel. These flywheels are made from two-piece billet aluminium. They are specifically designed to reduce weight and inertia for better engine response. After professionally installed the flywheel requires a 500 mile break-in period. Weighs only 3.63kgs. FIDANZA Lightweight flywheels work with every clutch including Exedy, ACT, Fidanza, Clutchmasters, and other OEM clutch kits CAD designed, CNC machined and computer balanced.