Pinewood Derby parents and scouts, this tungsten weight set is your secret weapon for building a competitive car. Unlike lead weights that are toxic and difficult to work with, these tungsten cylinders are completely safe for kids to handle while being 1.7 times denser - meaning you can add more weight in less space, which is crucial for optimal car performance. The set includes 12 pieces total: four different sizes (1/2 oz, 1/4 oz, 1/8 oz, and 1/16 oz) that let you fine-tune your car's weight distribution perfectly. The 3/8-inch diameter is standard for most pinewood derby cars, making installation simple with a basic electric drill. I've helped multiple scouts with their cars using these weights, and the ability to precisely adjust weight placement makes a noticeable difference in speed and stability. The cylindrical shape with rounded edges is much safer than sharp lead pieces, and the included plastic case keeps everything organized between uses. The 99.95% pure tungsten ensures consistent density, so you're not guessing about actual weight. Whether you're aiming for maximum speed or just want a stress-free weighting solution, this set takes the guesswork out of hitting that perfect 5-ounce limit. The value is excellent compared to buying individual weights or messing with messy lead alternatives. Seriously, if you want to give your scout the best chance at derby success while keeping things safe and simple, this tungsten weight set delivers professional results with kid-friendly convenience.