This is the optional Revolution Design Racing Products RB6 Vented Slipper Plate Set. These slipper plates are CNC-machined from 7075-T6 aluminum and hard anodized for rigidity and long life. The venting holes allow the slipper pads to "breathe", resulting in more consistent and reliable slipper action. These are especially useful when running low-turn modified motors in hot ambient temperatures. The slipper plates are a direct replacement for the stock plates and are compatible with Kyosho's RB6 2WD buggy and RT6 2WD stadium truck.