This may be a limited version choice component the FS-12FZ radiance engine, which can be found into the new launch for Item 84390 TG10-Mk.2FZ Chassis Kit.
Made from lightweight aluminum, the flywheel represents a weight saving of around 15g versus kit standard sintered component. The excess fat decrease provides far better engine rotation impact. Could be a blue anodized finish. Appropriate TG10-Mk.2FX and TG10-Mk.2FZ automobiles.