A scientifically designed racer, which includes an aerodynamic design and innovative weight system. Its design was created with consideration for racing properties, such as aerodynamics, weight distribution and airflow factors. Proper placement of the weight enables you to fine tune your racer for winning results. Wheels and axles should be the same on all cars in a race. Official BSA wheels and axles will fit cars. Kit Includes: Pre-Cut racer body, 2 One-piece axles, 5 Hubcap Strip, Wheels, Flat weight, Aerodynamic weight, Screws for weights, and Instructions.