This is a optional RPM Rear Step Bumper, and is intended for use with the Traxxas T-Maxx, and E-Maxx monster trucks. RPM bumpers are known for their strength and durability. Those same qualities are integrated into these bumpers for the T-Maxx & E-Maxx. These bumpers are not only the strongest bumpers made, they are extremely lightweight and have a scale, realistic appearance. The rear bumpers have the scale appearance of a step bumper found on most full-sized trucks, and weighs the same as a stock bumper, yet is stronger, and supports the rear skid plate for added rear-end protection. In addition, RPM has designed a recessed area where you, with a little creativity, can add in a customized, scale license plate or a ball hitch!