More weight equals more wins! gain a competitive edge and make your pinewood Derby racer run faster. Just add round chassis weights! 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. Install by drilling a 0.4" dia. Hole into your racer, and then use glue (sold separately) to safely secure the weights to your car's chassis. Pliers and glue required. NOTE: always check your local event for specific racing rules.