The Speed Racer Kit is 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. Pinewood Derby Car Speed Racer Kit By PineCar Racer™ This is the Speed Racer Kit from PineCar®. FEATURES: A scientifically designed racer, which includes an aerodynamic design and innovative weight system. Its design was created using principles of physics,with consideration for racing properties, such as aerodynamics, weight distribution and airflow factors. Proper placement of the weight on a racer enables you to fine-tune it for winning results. Two weights provided: an incremental adjustable flat weight & an aerodynamic weight. Instructions provided within the package. INCLUDES: (1) Wood Racer Body (2) Weights (4) Wheels (2) One-Piece Axles REQUIRES: Hammer, Screwdriver (+), Speed Kit PIN456, Super Glue (PIN1381) or Formula Glue PIN384, Wheel Alignment Tool PIN1456. Pinewood Derby Car Speed Racer Kit By PineCar Racer™ PIN3935Regular Price: $10.98Sale Price: 32 YEARS OF GREAT LOW HOBBY PRICES If You Have Questions, Please Call Toll Free, 1-800-225-6509 Ask for Doug