★These red racing parts for the AR chassis include 2 pre-cut 5mm brake sponges of differing friction quality. The stay has a skid-shaped front to ensure that sponge remains attached, and it has the effect of reducing speed loss on Mini 4WD course grass sections. 2-level rollers cushion jump landings to ensure that the machine stays on the track surface and away from the fence. Brake set effects can be adjusted by altering the attachment direction, and also the height through the use of different spacer and screw combinations. This set is compatible with both small- and large-diameter tires.