This is an optional Traxxas X-Maxx Roof Skid Plate, a quality part made from a durable composite material that is tough enough to take a bashing and still protect your monster truck body. This skid plate is made from the same material as Traxxas heavy-duty suspension arms, designed to flex instead of break, even in cold conditions. These skid plates protect the roof during rollovers and can allow you to customize the X-Maxx with multiple different color choices.
