★The brake set is a must-have item for racers who are aiming at the podium in official contests. The brake sponge comes pre-cut in 5mm widths, and two different frictions of sponge are included. ★The brake can be applied to the front or rear of the car, and is compatible with both small- and large-diameter wheels/tires. ★Compatible with: MA, AR and Super-II Chassis.