This really is a restricted version option part the FS-12FZ glow engine, which is utilized in the latest release for Item 84390 TG10-Mk.2FZ Chassis Kit.
Made from lightweight aluminum, the flywheel represents a weight saving of around 15g when compared with kit standard sintered component. The extra weight reduction offers better motor rotation reaction. Comes in a blue anodized finish. Suitable for TG10-Mk.2FX and TG10-Mk.2FZ cars.