Lead-free Round Weights are easy to install. Drill 3/8" diameter hole in car. Cut off the weight you need, keeping car as heavy as specifications allow. Then, insert the weight into the body of the racer. Fill with Body Putty (P3928). Sand when dry, then paint. Made of a lead-free alloy. Approximately 1 oz (28.3 g) each Pinecar Round Weights
914-386-2277