Gain a competitive edge and make your Pinewood Derby® racer run faster. These weights are sectioned off into different sizes, allowing you to easily fine-tune your car per race regulations. Use the included screws to safely secure the weights to your car's chassis. Pliers required. Includes: One set of 2.1 oz. Tapered Chassis Weights, Two screws. Length: 4.5". Width: 1.3". Weight: 2.1 oz. Age: 8+