The SKID Monster is a set of castering wheels, capable of rotating 360 degrees, which is attached to the rear wheels. Simply remove the two rear tires and bolt the SKID Monster in place. No permanent modification to the car is needed! Driven with the castering device in a locked position, the SKID Monster handles like the average family car. However, whenever the instructor flips a switch to unlock the casters the back of the car swings, and simulates the effects of suddenly losing traction to the rear wheels -- resulting in a monstrous challenge.