Stabilizer heads are a great way of reducing roll and boosting stability through corners when installed onto a Mini 4WD race car. Put these on your Mini 4WD racing machine for improved overall performance on the race track. This set comes in a fun purple color! - 17mm Stabilizer Heads (Purple) x2 - 19mm Rollers (Purple) x2 - Nuts, washers, and other small parts for attachment included. - Stabilizer head parts are low-friction POM. - Compatible with Mini 4WD and Mini 4WD PRO cars.