FunisFun 3.25oz Weights Tungsten for Pinewood Derby Car, Incremental Cylinders Weights with 5 Different Sizes for Fastest Derby Car Speed

FunisFun 3.25oz Weights Tungsten... https://www.amazon.com/dp/B09QLY5558?ref=ppx_pop_mob_ap_share These were mine. Be sure that once you've found your sweet spot with the weights glue them in so they don't bounce around