Mass dampers are a critical weapon in your armory, helping keep the machine firmly on the track when negotiating circuits with lane changes, table-top sections and the like. ★The mass dampers weights in this set feature a cool black finish, with matching grey stabilizer balls. ★Can be installed on the front or rear of your car. ★Set comes with two weights, plus 25mm and 30mm screws (three each) for attachment. ★Compatible with: Mini 4WD and Mini 4WD PRO cars (some bodies may require modification).