Weights are one of the most important factors when building a winning derby 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. The Wedge Weight is incremental, allowing adjustments to your car's weight, even on race day! Break off just enough to meet specifications, keeping car as heavy as possible. Attach the weight to the bottom or counter-sink it under the car with the screws. Made of a lead-free alloy. Approximately 1.75 ounces.