Gain a competitive edge and make your Pinewood Derby® racer run faster. The weights are sectioned off into different sizes, allowing you to easily fine-tune your car per race regulations. Use glue (sold separately) to safely secure the weights to your car's chassis. Pliers and glue required. These ultra-safe, 99.99% lead-free weights are sectioned off into different sizes, allowing you to easily fine-tune your car per race regulations. Includes: One set of 2.4 oz. Combo Chassis Weights. Length: 0.5". Width: 0.4". Weight: 2.4 oz. Ages: 8+