This might be a limited edition option component for the FS-12FZ radiance motor, which can be utilized in the new release for Item 84390 TG10-Mk.2FZ Chassis Kit.
Made from lightweight aluminum, the flywheel represents a weight saving of around 15g compared to kit standard sintered component. The weight reduction gives more efficient motor rotation reaction. Will come in a blue anodized finish. Suitable for TG10-Mk.2FX and TG10-Mk.2FZ vehicles.