Weights are one of the most important factors when building a winning PineCar racer. The heavier your racer is, the faster it will go! Most racing specifications require your racer weigh as close to five ounces as you can get it, but must not exceed five ounces. Bar Weights are incremental, which allow adjustments to a car's weight, even on race day! Break off just enough to meet specifications, keeping the car as heavy as possible. Attach the weight to the bottom, or counter-sink it under the car with the screws, which are included. Made of a lead-free alloy. Approximately 2 ounces.