LEGO Technic Ford Mustang Shelby GT500 set, number 42138. The set consists of 544 pieces and is designed for children aged 9 and up. Key features Pull-back function: The car is equipped with two pull-back motors, allowing you to pull it back and then let it race forward. Augmented Reality (AR): Using the special LEGO Technic AR+ app, you can enhance the play experience with interactive augmented reality features, such as racing and completing challenges. Design: The model is a detailed replica of the iconic Shelby GT500, finished in vibrant green with white racing stripes. Educational: Building the set provides a fun introduction to the basic principles of engineering and mechanics. Display model: Once building is complete, you can add the rear cover to present the car as a sleek display model.