Pinewood Derby Weight 3.5oz Lead Canopy by Derby Dust 3.5 ounces. Will never be less can be over. If an exact desired 3.5 oz is required, do not order this. this is not a precision measurement. Lead Canopy - can be drilled lighter from the underneath if needed. Flat Bottom, no mounting lug. Will require gluing. Pinewood Derby Car Weights Weights for Pinewood Derby Decorative Pinewood Derby Weights