The more your car weighs, the faster it will go on a downhill ramp. Most rules specify a 5 oz. maximum weight. Most Pinewood Derby cars weigh between 1.5 oz and 3.5 oz (depending on design) without weights so a car may need 3.5 oz or more of additional weight.
Each segment is 1/2 "X 1/2" X 1/8"
Stick-On Weights
These 12 individual .15 oz weights work great for fine tuning the weight of your Pinewood Derby car. They have an adhesive backing so it is very easy to attach them to your car.